43 + Mcqs in Refraction of Light Page 1 McqOptions

1.	Two thin lenses of power +5 D and -2 D are placed in contact with each other. Focal length of the combination is
A.	+3 m
B.	-3 m
C.	0.33 m
D.	-0.33 m
Answer» D. -0.33 m

Discussion

2.	An object is placed before a concave lens. The image formed _____________-.
A.	is always erect
B.	may be erect or inverted
C.	is always inverted
D.	is always real
Answer» B. may be erect or inverted

Discussion

3.	A convex lens has a focal length of 20 cm. Its power in dioptres is ___________.
A.	2
B.	5
C.	0.5
D.	0.2
Answer» C. 0.5

Discussion

4.	The least distance of distinct vision is ______.
A.	25 cm
B.	25 m
C.	0.25 cm
D.	2.5 m
Answer» B. 25 m

Discussion

5.	An object is placed 25 cm from a convex lens whose focal length is 10 cm. The image distance is ________ cm.
A.	50 cm
B.	16.66 cm
C.	6.66 cm
D.	10 cm
Answer» C. 6.66 cm

Discussion

6.	A virtual image is formed by _______.
A.	a slide projector in a cinema hall
B.	the ordinary camera
C.	a simple microscope
D.	telescope
Answer» D. telescope

Discussion

7.	The image produced by a concave lens is ________.
A.	always virtual and enlarged
B.	always virtual and reduced in size
C.	always real
D.	sometimes real, sometimes virtual
Answer» C. always real

Discussion

8.	When a person uses a convex lens as a simple magnifying glass, the object must be placed at a distance.
A.	less than one focal length
B.	more than one focal length
C.	less than twice the focal length
D.	more than twice the focal length
Answer» B. more than one focal length

Discussion

9.	An object is placed 12 cm from a convex lens whose focal length is 10 cm. The image must be.
A.	virtual and enlarged
B.	virtual and reduced in size
C.	real and reduced in size
D.	real and enlarged
Answer» E.

Discussion

10.	Real images formed by single convex lenses are always ________________.
A.	on the same side of the lens as the object
B.	inverted
C.	erect
D.	smaller than the object
Answer» C. erect

Discussion

11.	The focal length of a lens whose power is -1.5 D is _______.
A.	-66.66 cm
B.	+ 1.5 m
C.	+ 66.66 cm
D.	-1.5 m
Answer» B. + 1.5 m

Discussion

12.	The power of a convex lens of focal length 50 cm is ______.
A.	+ 2D
B.	- 2D
C.	50 D
D.	- 5D
Answer» B. - 2D

Discussion

13.	A positive magnification greater than unity indicates _____________________.
A.	real image
B.	virtual image
C.	neither real not virtual image
D.	distorted image
Answer» C. neither real not virtual image

Discussion

14.	A convex lens is called _________.
A.	converging lens
B.	diverging lens
C.	both converging and diverging lens
D.	refracting lens
Answer» B. diverging lens

Discussion

15.	Reciprocal of focal length in metres is known as the ______ of a lens.
A.	focus
B.	power
C.	power of accommodation
D.	far point
Answer» C. power of accommodation

Discussion

16.	In a simple microscope lens used is __________.
A.	biconvex
B.	biconvex
C.	plano convex
D.	plano convex
Answer» B. biconvex

Discussion

17.	1 D is the power of the lens of focal length of ______ cm.
A.	100
B.	10
C.	1/100
D.	1/10
Answer» B. 10

Discussion

18.	SI unit of the power of a lens is ___________.
A.	dioptre
B.	cm
C.	metre
D.	watt
Answer» B. cm

Discussion

19.	Where should an object be placed so that a real and inverted image of the same size is obtained, using a convex lens?
A.	Between O and F
B.	At F
C.	At 2 F
D.	At infinity
Answer» D. At infinity

Discussion

20.	Parallel rays of light entering a convex lens always converge at _______.
A.	centre of curvature
B.	the principal focus
C.	optical centre
D.	the focal plane
Answer» C. optical centre

Discussion

21.	Convex lens always gives a real image if the object is situated beyond _______.
A.	optical centre
B.	centre of curvature
C.	focus
D.	radius of curvature
Answer» D. radius of curvature

Discussion

22.	The part of the lens through which the ray of light passes without suffering deviation is called ________.
A.	optical centre
B.	focus
C.	centre of curvature
D.	pole
Answer» B. focus

Discussion

23.	The bending of a beam of light when it passes obliquely from one medium to another is known as _______.
A.	reflection
B.	refraction
C.	refraction
D.	deviation
Answer» C. refraction

Discussion

24.	Speed of light in air/speed of light in medium is equal to
A.	index of defraction
B.	index of defraction
C.	index of defraction
D.	index of refraction
Answer» E.

Discussion

25.	To describe change in speed of light in a medium, term used is called
A.	index of reflection
B.	index of refraction
C.	index of defractionc
D.	index of acoustics
Answer» C. index of defractionc

Discussion

26.	Refraction of light has been proved by
A.	Law of Einstein
B.	Law of Einstein
C.	Law of Refraction
D.	Law of Thomas
Answer» D. Law of Thomas

Discussion

27.	Ray of light is always refracted in
A.	indefinite direction
B.	definite direction
C.	definite position
D.	indefinite position
Answer» C. definite position

Discussion

28.	Name given to a change in speed of light is known as
A.	reflection
B.	critical change
C.	refraction
D.	diffraction of light
Answer» D. diffraction of light

Discussion

29.	If light enters a glass, it slows down more than
A.	200,000 km/s
B.	150,000 km/s
C.	100,000 km/s
D.	50,000 km/s
Answer» C. 100,000 km/s

Discussion

30.	If light enters any substance with refractive index, it is
A.	perpendicular
B.	at a certain angle
C.	parallel
D.	at critical angle
Answer» D. at critical angle

Discussion

31.	Ratio of sin (x°) of angle of incidence to sin (x°) of angle of refraction is
A.	Gravitational law
B.	Reflection law
C.	refraction law
D.	Snells law
Answer» E.

Discussion

32.	Bending of light as it passes from one medium to another is called
A.	reflection
B.	diffraction
C.	refraction
D.	deflection
Answer» D. deflection

Discussion

33.	Refractive index of a medium is
A.	Speed of light in air to speed of light in vacuum
B.	Speed of light in vacuum to speed of light in air
C.	focal length to object distance
D.	speed of light in the medium x speed of light in the air
Answer» B. Speed of light in vacuum to speed of light in air

Discussion

34.	Quantity which does not changes during refraction is
A.	direction
B.	speed
C.	frequency
D.	wavelength
Answer» D. wavelength

Discussion

35.	The radius of curvature of a mirror is 20cm the focal length is
A.	20cm
B.	10cm
C.	40cm
D.	5cm
Answer» C. 40cm

Discussion

36.	The unit of power of lens is
A.	Metre
B.	Metre
C.	Diopter
D.	M-1
Answer» D. M-1

Discussion

37.	Convex lens focus a real, point sized image at focus, the object is placed
A.	At focus
B.	Between F and 2F
C.	At infinity
D.	At 2F
Answer» D. At 2F

Discussion

38.	The optical phenomena, twinkling of stars, is due to
A.	Atmospheric reflection
B.	Total reflection
C.	Atmospheric refraction
D.	Total refraction
Answer» D. Total refraction

Discussion

39.	In optics an object which has higher refractive index is called
A.	Optically rarer
B.	Optically denser
C.	Optical density
D.	Refractive index
Answer» C. Optical density

Discussion

40.	A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is
A.	At infinity
B.	Between F and C
C.	Between P and F
D.	At E
Answer» D. At E

Discussion

41.	Power of the lens is -40, its focal length is
A.	4m
B.	-40m
C.	-0.25m
D.	-25m
Answer» D. -25m

Discussion

42.	A concave mirror gives real, inverted and same size image if the object is placed
A.	At F
B.	At infinity
C.	At C
D.	Beyond C
Answer» D. Beyond C

Discussion

43.	Image formed by plane mirror is
A.	Real and erect
B.	Real and inverted
C.	Virtual and erect
D.	Virtual and inverted
Answer» D. Virtual and inverted

Discussion

Explore topic-wise MCQs in Maharashtra CET.

&nbsp;&nbsp;Two&nbsp;thin&nbsp;lenses&nbsp;of&nbsp;power&nbsp;+5&nbsp;D&nbsp;and&nbsp;-2&nbsp;D&nbsp;are&nbsp;placed&nbsp;in&nbsp;contact&nbsp;with&nbsp;each&nbsp;other.&nbsp;Focal&nbsp;length&nbsp;of&nbsp;the&nbsp;combination&nbsp;is

&nbsp;&nbsp;&nbsp;An&nbsp;object&nbsp;is&nbsp;placed&nbsp;before&nbsp;a&nbsp;concave&nbsp;lens.&nbsp;The&nbsp;image&nbsp;formed&nbsp;_____________-.

&nbsp;A&nbsp;convex&nbsp;lens&nbsp;has&nbsp;a&nbsp;focal&nbsp;length&nbsp;of&nbsp;20&nbsp;cm.&nbsp;Its&nbsp;power&nbsp;in&nbsp;dioptres&nbsp;is&nbsp;___________.

&nbsp;&nbsp;The&nbsp;least&nbsp;distance&nbsp;of&nbsp;distinct&nbsp;vision&nbsp;is&nbsp;______.

&nbsp;An&nbsp;object&nbsp;is&nbsp;placed&nbsp;25&nbsp;cm&nbsp;from&nbsp;a&nbsp;convex&nbsp;lens&nbsp;whose&nbsp;focal&nbsp;length&nbsp;is&nbsp;10&nbsp;cm.&nbsp;The&nbsp;image&nbsp;distance&nbsp;is&nbsp;________&nbsp;cm.

&nbsp;&nbsp;A&nbsp;virtual&nbsp;image&nbsp;is&nbsp;formed&nbsp;by&nbsp;_______.

&nbsp;The&nbsp;image&nbsp;produced&nbsp;by&nbsp;a&nbsp;concave&nbsp;lens&nbsp;is&nbsp;________.

&nbsp;&nbsp;When&nbsp;a&nbsp;person&nbsp;uses&nbsp;a&nbsp;convex&nbsp;lens&nbsp;as&nbsp;a&nbsp;simple&nbsp;magnifying&nbsp;glass,&nbsp;the&nbsp;object&nbsp;must&nbsp;be&nbsp;placed&nbsp;at&nbsp;a&nbsp;distance.

&nbsp;&nbsp;An&nbsp;object&nbsp;is&nbsp;placed&nbsp;12&nbsp;cm&nbsp;from&nbsp;a&nbsp;convex&nbsp;lens&nbsp;whose&nbsp;focal&nbsp;length&nbsp;is&nbsp;10&nbsp;cm.&nbsp;The&nbsp;image&nbsp;must&nbsp;be.

&nbsp;&nbsp;Real&nbsp;images&nbsp;formed&nbsp;by&nbsp;single&nbsp;convex&nbsp;lenses&nbsp;are&nbsp;always&nbsp;________________.

&nbsp;&nbsp;The&nbsp;focal&nbsp;length&nbsp;of&nbsp;a&nbsp;lens&nbsp;whose&nbsp;power&nbsp;is&nbsp;-1.5&nbsp;D&nbsp;is&nbsp;_______.

&nbsp;&nbsp;The&nbsp;power&nbsp;of&nbsp;a&nbsp;convex&nbsp;lens&nbsp;of&nbsp;focal&nbsp;length&nbsp;50&nbsp;cm&nbsp;is&nbsp;______.

&nbsp;&nbsp;&nbsp;A&nbsp;positive&nbsp;magnification&nbsp;greater&nbsp;than&nbsp;unity&nbsp;indicates&nbsp;_____________________.

&nbsp;&nbsp;A&nbsp;convex&nbsp;lens&nbsp;is&nbsp;called&nbsp;_________.

&nbsp;&nbsp;Reciprocal&nbsp;of&nbsp;focal&nbsp;length&nbsp;in&nbsp;metres&nbsp;is&nbsp;known&nbsp;as&nbsp;the&nbsp;______&nbsp;of&nbsp;a&nbsp;lens.

&nbsp;&nbsp;In&nbsp;a&nbsp;simple&nbsp;microscope&nbsp;lens&nbsp;used&nbsp;is&nbsp;__________.

&nbsp;&nbsp;1&nbsp;D&nbsp;is&nbsp;the&nbsp;power&nbsp;of&nbsp;the&nbsp;lens&nbsp;of&nbsp;focal&nbsp;length&nbsp;of&nbsp;______&nbsp;cm.

SI&nbsp;unit&nbsp;of&nbsp;the&nbsp;power&nbsp;of&nbsp;a&nbsp;lens&nbsp;is&nbsp;___________.

&nbsp;&nbsp;Where&nbsp;should&nbsp;an&nbsp;object&nbsp;be&nbsp;placed&nbsp;so&nbsp;that&nbsp;a&nbsp;real&nbsp;and&nbsp;inverted&nbsp;image&nbsp;of&nbsp;the&nbsp;same&nbsp;size&nbsp;is&nbsp;obtained,&nbsp;using&nbsp;a&nbsp;convex&nbsp;lens?

&nbsp;&nbsp;&nbsp;Parallel&nbsp;rays&nbsp;of&nbsp;light&nbsp;entering&nbsp;a&nbsp;convex&nbsp;lens&nbsp;always&nbsp;converge&nbsp;at&nbsp;_______.

&nbsp;&nbsp;&nbsp;Convex&nbsp;lens&nbsp;always&nbsp;gives&nbsp;a&nbsp;real&nbsp;image&nbsp;if&nbsp;the&nbsp;object&nbsp;is&nbsp;situated&nbsp;beyond&nbsp;_______.

&nbsp;&nbsp;The&nbsp;part&nbsp;of&nbsp;the&nbsp;lens&nbsp;through&nbsp;which&nbsp;the&nbsp;ray&nbsp;of&nbsp;light&nbsp;passes&nbsp;without&nbsp;suffering&nbsp;deviation&nbsp;is&nbsp;called&nbsp;________.

&nbsp;&nbsp;&nbsp;The&nbsp;bending&nbsp;of&nbsp;a&nbsp;beam&nbsp;of&nbsp;light&nbsp;when&nbsp;it&nbsp;passes&nbsp;obliquely&nbsp;from&nbsp;one&nbsp;medium&nbsp;to&nbsp;another&nbsp;is&nbsp;known&nbsp;as&nbsp;_______.

&nbsp;Speed&nbsp;of&nbsp;light&nbsp;in&nbsp;air/speed&nbsp;of&nbsp;light&nbsp;in&nbsp;medium&nbsp;is&nbsp;equal&nbsp;to

&nbsp;To&nbsp;describe&nbsp;change&nbsp;in&nbsp;speed&nbsp;of&nbsp;light&nbsp;in&nbsp;a&nbsp;medium,&nbsp;term&nbsp;used&nbsp;is&nbsp;called

Refraction&nbsp;of&nbsp;light&nbsp;has&nbsp;been&nbsp;proved&nbsp;by

&nbsp;Ray&nbsp;of&nbsp;light&nbsp;is&nbsp;always&nbsp;refracted&nbsp;in

&nbsp;Name&nbsp;given&nbsp;to&nbsp;a&nbsp;change&nbsp;in&nbsp;speed&nbsp;of&nbsp;light&nbsp;is&nbsp;known&nbsp;as

If&nbsp;light&nbsp;enters&nbsp;a&nbsp;glass,&nbsp;it&nbsp;slows&nbsp;down&nbsp;more&nbsp;than

If&nbsp;light&nbsp;enters&nbsp;any&nbsp;substance&nbsp;with&nbsp;refractive&nbsp;index,&nbsp;it&nbsp;is

Ratio&nbsp;of&nbsp;sin&nbsp;(x&deg;)&nbsp;of&nbsp;angle&nbsp;of&nbsp;incidence&nbsp;to&nbsp;sin&nbsp;(x&deg;)&nbsp;of&nbsp;angle&nbsp;of&nbsp;refraction&nbsp;is

Bending&nbsp;of&nbsp;light&nbsp;as&nbsp;it&nbsp;passes&nbsp;from&nbsp;one&nbsp;medium&nbsp;to&nbsp;another&nbsp;is&nbsp;called

Refractive&nbsp;index&nbsp;of&nbsp;a&nbsp;medium&nbsp;is

Quantity&nbsp;which&nbsp;does&nbsp;not&nbsp;changes&nbsp;during&nbsp;refraction&nbsp;is

The&nbsp;radius&nbsp;of&nbsp;curvature&nbsp;of&nbsp;a&nbsp;mirror&nbsp;is&nbsp;20cm&nbsp;the&nbsp;focal&nbsp;length&nbsp;is

&nbsp;&nbsp;&nbsp;The&nbsp;unit&nbsp;of&nbsp;power&nbsp;of&nbsp;lens&nbsp;is

Convex&nbsp;lens&nbsp;focus&nbsp;a&nbsp;real,&nbsp;point&nbsp;sized&nbsp;image&nbsp;at&nbsp;focus,&nbsp;the&nbsp;object&nbsp;is&nbsp;placed

The&nbsp;optical&nbsp;phenomena,&nbsp;twinkling&nbsp;of&nbsp;stars,&nbsp;is&nbsp;due&nbsp;to

In&nbsp;optics&nbsp;an&nbsp;object&nbsp;which&nbsp;has&nbsp;higher&nbsp;refractive&nbsp;index&nbsp;is&nbsp;called

&nbsp;&nbsp;&nbsp;A&nbsp;concave&nbsp;mirror&nbsp;gives&nbsp;virtual,&nbsp;refract&nbsp;and&nbsp;enlarged&nbsp;image&nbsp;of&nbsp;the&nbsp;object&nbsp;but&nbsp;image&nbsp;of&nbsp;smaller&nbsp;size&nbsp;than&nbsp;the&nbsp;size&nbsp;of&nbsp;the&nbsp;object&nbsp;is

&nbsp;Power&nbsp;of&nbsp;the&nbsp;lens&nbsp;is&nbsp;-40,&nbsp;its&nbsp;focal&nbsp;length&nbsp;is

&nbsp;&nbsp;&nbsp;A&nbsp;concave&nbsp;mirror&nbsp;gives&nbsp;real,&nbsp;inverted&nbsp;and&nbsp;same&nbsp;size&nbsp;image&nbsp;if&nbsp;the&nbsp;object&nbsp;is&nbsp;placed

&nbsp;Image&nbsp;formed&nbsp;by&nbsp;plane&nbsp;mirror&nbsp;is

Two thin lenses of power +5 D and -2 D are placed in contact with each other. Focal length of the combination is

An object is placed before a concave lens. The image formed _____________-.

A convex lens has a focal length of 20 cm. Its power in dioptres is ___________.

The least distance of distinct vision is ______.

An object is placed 25 cm from a convex lens whose focal length is 10 cm. The image distance is ________ cm.

A virtual image is formed by _______.

The image produced by a concave lens is ________.

When a person uses a convex lens as a simple magnifying glass, the object must be placed at a distance.

An object is placed 12 cm from a convex lens whose focal length is 10 cm. The image must be.

Real images formed by single convex lenses are always ________________.

The focal length of a lens whose power is -1.5 D is _______.

The power of a convex lens of focal length 50 cm is ______.

A positive magnification greater than unity indicates _____________________.

A convex lens is called _________.

Reciprocal of focal length in metres is known as the ______ of a lens.

In a simple microscope lens used is __________.

1 D is the power of the lens of focal length of ______ cm.

SI unit of the power of a lens is ___________.

Where should an object be placed so that a real and inverted image of the same size is obtained, using a convex lens?

Parallel rays of light entering a convex lens always converge at _______.

Convex lens always gives a real image if the object is situated beyond _______.

The part of the lens through which the ray of light passes without suffering deviation is called ________.

The bending of a beam of light when it passes obliquely from one medium to another is known as _______.

Speed of light in air/speed of light in medium is equal to

To describe change in speed of light in a medium, term used is called

Refraction of light has been proved by

Ray of light is always refracted in

Name given to a change in speed of light is known as

If light enters a glass, it slows down more than

If light enters any substance with refractive index, it is

Ratio of sin (x°) of angle of incidence to sin (x°) of angle of refraction is

Bending of light as it passes from one medium to another is called

Refractive index of a medium is

Quantity which does not changes during refraction is

The radius of curvature of a mirror is 20cm the focal length is

The unit of power of lens is

Convex lens focus a real, point sized image at focus, the object is placed

The optical phenomena, twinkling of stars, is due to

In optics an object which has higher refractive index is called

A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is

Power of the lens is -40, its focal length is

A concave mirror gives real, inverted and same size image if the object is placed

Image formed by plane mirror is