1. How tall does a flat mirror have to be if it is “full-length”, i.e, if you can see your full height in it? A] a quarter your height B] half your height C] the same as your height D] twice your height Ans: B half height. Draw rays.

2. Two plane mirrors are placed at 60°. How many images of the candle are there (not including the candle itself)? A] 1 B] 2 C] 3 D] 5 E] infinitely many Ans 5. Images of images are images.

3. The side of a pool is mirrored. Looking up toward a (waterproof) flashlight, how many images (not including the object) can be seen? A] 0 B] 1 C] 2 D] 3 E] 4 Ans: 3

4. Which image do you think would be the dimmest? (Hint: the total internal reflection angle for water/air is about 44°) Or choose E All are the same brightness as the actual bulb Ans: B. The rays that reflect to give that image don’t totally reflect. Rays from c reflect at a bigger angle, so the reflection is stronger.

5. If s < f, is the image from a mirror is A] real B] virtual C] non-existent