A concave refracting surface of a medium with index of refraction n produces a real image no matter where an object is placed outside: 

A. always 

B. only if the index of refraction of the surrounding medium is less than n 

C. only if the index of refraction of the surrounding medium is greater than n 

D. never 

E. none of the above

A parallel beam of monochromatic light in air is incident on a plane glass surface. In the glass, the beam: 

A. remains parallel 

D. undergoes dispersion 

B. becomes diverging 

E. follows a parabolic path 

C. becomes converging

A convex 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 r 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 r from the surface 

E. remains real 

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

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

The image produced by a convex mirror of an erect object in front of the mirror is always: 

A. virtual, erect, and larger than the object 

B. virtual, erect, and smaller than the object 

C. real, erect, and larger than the object 

D. real, erect, and smaller than the object 

E. none of the above

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 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

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

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