What does first law of reflection state?

The incident ray, reflected ray and normal ray, at the point of incidence, are perpendicular to each other

The incident ray, reflected ray and normal ray, at the point of incidence, are in same plane

The incident ray, reflected ray and normal ray, at the point of incidence, are perpendicular to each other

The incident ray, reflected ray and normal ray at the point of incidence are in different plane

11 + Mcqs in Dispersion, Fermats Principle & its Application in Engineering Physics Page 1 McqOptions

1.	Dispersive power of the material of the prism is 0.0221. If the deviation produced by it for yellow color is 38 , then the angular dispersion between red and violet color is?
A.	0.84
B.	0.65
C.	0.48
D.	1.26
Answer» B. 0.65

2.	Find the ratio of mean deviation produced, if the ratio of dispersive power of the material of two prism are 2:3 and ratio of angular dispersions produced by them is 1:2.
A.	1:3
B.	4:3
C.	3:1
D.	3:4
Answer» E.

3.	A crown glass prism with refractive index 6 is to be achromatized for red and blue color light with flint glass prism. What will be the angle of flint glass prism? ( _r = 1.513, _r = 1.645, ₂ = 1.523 and ₂ = 1.665, Where _r and ₂ are refractive indices of red and blue light respectively whereas, _r and ₂ are refractive indices of red and blue light respectively for flint glass.)
A.	1.5
B.	2.4
C.	3
D.	4.5
Answer» D. 4.5

4.	A thin prism P₁ having angle 4 and refractive index 1.54 is combined with another thin prism P₂ of refractive index 1.72 for producing dispersion without deviation. The angle of P₂ is?
A.	4
B.	5.33
C.	3
D.	2.6
Answer» D. 2.6

5.	White light is passed through a prism having angle 5 . If the refractive indices for red color and blur color are 1.641 and 1.659 respectively. Find the angle between them.
A.	3.295
B.	4
C.	0.090
D.	0.65
Answer» D. 0.65

6.	If light travels in a medium of Refractive Index 1.4 through a distance 250 m in a given time interval, then how much distance will it cover in refractive index 1.75?
A.	250 m
B.	500 m
C.	200 m
D.	312.5 m
Answer» D. 312.5 m

7.	If a monochromatic light goes through 2 cm of glass or 2.25 cm of water, the optical path is the same. If refractive index of glass is 1.50, then what is the refractive index of water?
A.	1.33
B.	1.23
C.	1.50
D.	1.13
Answer» B. 1.23

8.	What does first law of reflection state?
A.	The incident ray, reflected ray and normal ray, at the point of incidence, are in same plane
B.	The incident ray, reflected ray and normal ray, at the point of incidence, are perpendicular to each other
C.	The incident ray, reflected ray and normal ray at the point of incidence are in different plane
D.	mSin(i)=nSir(r)
Answer» B. The incident ray, reflected ray and normal ray, at the point of incidence, are perpendicular to each other

9.	Name the person, who formed The Principle of least time ?
A.	Pierre de Fermat
B.	C.V Raman
C.	John Kepler
D.	Albert Abraham Michelson
Answer» B. C.V Raman

10.	What will be the time taken by a ray of light travelling from one point to another, by any number of refractions & reflections follows that particular path?
A.	Highest
B.	Least
C.	Maximum
D.	Moderate
Answer» C. Maximum

11.	The product of the Geometric Length of the path light follows through the system, and the refractive index of the medium is known as __________
A.	Fermat Path
B.	Optical Path
C.	Ray Path
D.	Optical Path Difference
Answer» C. Ray Path