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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
D. changes from real to virtual when it is r from the surface
D. changes from real to virtual when it is r from the surface
See lessAn 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
C. virtual, erect, and larger than the object
C. virtual, erect, and larger than the object
See lessA 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. remains parallel
A. remains parallel
See lessAn 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
D. virtual and erect
D. virtual and erect
See lessA 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
E. remains virtual
E. remains virtual
See lessReal 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
E. none of the above
E. none of the above
See lessWhere 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
D. Between the focal point and the lens
D. Between the focal point and the lens
See lessA 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
D. CS2 and immersed in water
D. CS2 and immersed in water
See lessWhich 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
E. The lens is diverging
E. The lens is diverging
See lessA 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
E. none of the above
E. none of the above
See less