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

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

An erect object is placed on the central axis of a thin lens, further from the lens than the magnitude of its focal length. The magnification is +0.4. This means: 

A. the image is real and erect and the lens is a converging lens 

B. the image is real and inverted and the lens is a converging lens 

C. the image is virtual and erect, and the lens is a diverging lens 

D. the image is virtual and erect, and the lens is a converging lens 

E. the image is virtual and inverted and the lens is a diverging lens

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

What type of eyeglasses should a nearsighted person wear? 

A. diverging lenses 

B. bifocal lenses 

C. converging lenses 

D. plano-convex lenses 

E. double convex lenses

A nearsighted person can see clearly only objects within 1.4 m of her eye. To see distant objects, she should wear eyeglasses of what type and focal length? 

A. diverging, 2.8 m 

B. diverging, 1.4 m 

C. converging, 2.8 m 

D. converging, 1.4 m 

E. diverging, 0.72 m

An erect object is located between a concave mirror and its focal point. Its image is: 

A. real, erect, and larger than the object 

B. real, inverted, and larger than the object 

C. virtual, erect, and larger than the object 

D. virtual, inverted, and larger than the object 

E. virtual, erect, and smaller than the object 

Real images formed by a spherical mirror are always: 

A. on the side of the mirror opposite the source 

B. on the same side of the mirror as the source but closer to the mirror than the source 

C. on the same side of the mirror as the source but closer to the mirror than the focal point 

D. on the same side of the mirror as the source but further from the mirror than the focal point 

E. none of the above

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 spherical refracting surface separates a medium with index of refraction 2 from air. The image of an object outside the surface is real: 

A. always 

B. never

C. only if it is close to the surface 

D. only if it is far from the surface 

E. only if the radius of curvature is small