25) A negative magnification for a mirror means that
A) the image is upright, and the mirror could be either concave or convex.
B) the image is inverted, and the mirror is concave.
C) the image is inverted, and the mirror could be either concave or convex.
D) the image is upright, and the mirror is convex
E) the image is inverted and the mirror is convex.
26) An object is placed in front of a thin lens, Which statements are correct in describing the image formed by the lens? (There could be more than one correct choice.)
A) If the lens is convex, the image must be real.
B) If the image is real, then it is also inverted.
C) If the image is real, then it is also upright.
D) If the lens is convex, the image will never be virtual.
E) If the lens is concave, the image must be virtual.
27) When a beam of light, originally travelling in air, enters a piece of glass having an index of refraction of 3/2, its frequency
A) is unaffected
B) is reduced to 2/3 its original value.
C) increased by a factor of 3/2.
28) The index of refraction of a type of glass is 1.50, and the index of refraction of water is 1.33. If the light enters water from the glass, the angle of refraction will be
A) equal to the angle of incidence.
B) less than the angle of incidence.
C) greater than the angle of incidence.
29) Which of the following terms describe lenses that are thinner at the center than the edges? (there could be more than one correct choice.)
A) concave lenses
B) converging lenses
C) diverging lenses
D) convex lenses
30) You may have seen ambulances on the street with the letters of the word AMBULANCE written on the front of them, in such a way to appear correctly when viewed in your car's rear-view mirror. (See the figure.) How do the letters appear when you look directly at the ambulance (not through the mirror)?
