a) When a ray of light encounters a surface at an angle, we measure the angle of

Question

a) When a ray of light encounters a surface at an angle, we measure the angle of interest relative to which of the following?
1. The direction made by the reflected ray
2. The direction made by the refracted ray
3. The surface
4. A line perpendicular to the surface

b) You look at your image in regular, flat mirror. Which of the following is true?
1. Your image is on the other side of the mirror but appears 50% closer to the mirror's surface than you actually are.
2. Your image appears at the surface of the mirror.
3. Your image appears on the other side of the mirror's surface at a distance equal to your distance from the mirror's surface.
4. Your image appears on the same side of the mirror as you but 50% closer to the mirror than you are.

c) For total internal reflection to occur, i.e., light in medium 1 entirely reflects off the boundary with medium 2 with no refraction taking place, which of the following must be true?
1. n1 < n2 and the incoming angle must be large
2. n1 > n2 and the incoming angle must be large
3. n1 < n2 and the incoming angle must be small
4. n1 > n2 and the incoming angle must be small

Explanation / Answer

a) A line perpendicular to the surface

b) Your image appears on the other side of the mirror's surface at a distance equal to your distance from the mirror's surface

c)  n1 > n2 and the incoming angle must be large

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