Which of the following is NOT correct for a simple magnifying glass? 

A. The image is virtual 

B. The image is erect 

C. The image is larger than the object 

D. The object is inside the focal point

E. The lens is diverging

Which instrument uses a single converging lens with the object placed just inside the focal point? 

A. Camera 

B. Compound microscope 

C. Magnifying glass 

D. Overhead projector 

E. Telescope

A convex refracting surface has a radius of 12 cm. Light is incident in air (n = 1) and refracted into a medium with an index of refraction of 2. To obtain light with rays parallel to the central axis after refraction a point source should be placed on the axis: 

A. 3 cm from the surface 

B. 6 cm from the surface 

C. 12 cm from the surface 

D. 18 cm from the surface 

E. 24 cm from the surface

Where must an object be placed in front of a converging lens in order to obtain a virtual image? 

A. At the focal point 

B. At twice the focal length 

C. Greater than the focal length 

D. Between the focal point and the lens 

E. Between the focal length and twice the focal length

An ordinary magnifying glass in front of an erect object produces an image that is: 

A. real and erect 

B. real and inverted 

C. virtual and inverted 

D. virtual and erect 

E. none of these

A man holds a rectangular card in front of and parallel to a plane mirror. In order for him to see the entire image of the card, the least mirror area needed is: 

A. that of the whole mirror, regardless of its size 

B. that of the pupil of his eye 

C. one-half that of the card 

D. one-fourth that of the card 

E. an amount which decreases with his distance from the mirror

A concave spherical surface with radius r separates a medium with index of refraction 2 from air. As an object is moved toward the surface from far away along the central axis, its image: 

A. changes from virtual to real when it is r/2 from the surface 

B. changes from virtual to real when it is 2r from the surface 

C. changes from real to virtual when it is r/2 from the surface 

D. changes from real to virtual when it is 2r from the surface 

E. remains virtual

An object is 2 m in front of a plane mirror. Its image is: 

A. virtual, inverted, and 2 m behind the mirror 

B. virtual, inverted, and 2 m in front of the mirror 

C. virtual, erect, and 2 m in front of the mirror 

D. real, erect, and 2 m behind the mirror 

E. none of the above

A hollow lens is made of thin glass, as shown. It can be filled with air, water (n = 1.3) or CS₂ (n = 1.6). The lens will diverge a beam of parallel light if it is filled with:

A. air and immersed in air 

B. air and immersed in water 

C. water and immersed in CS2 

D. CS₂ and immersed in water 

E. CS₂ and immersed in CS₂

A card marked IAHIO8 is standing upright in front of a plane mirror. Which of the following is NOT true? 

A. The image is virtual

B. The image shifts its position as the observer shifts his position 

C. The image appears as 8OIHAI to a person looking in the mirror 

D. The image is caused mostly by specular rather than diffuse reflection 

E. The image is the same size as the object