Optics Quiz True or False

1. Light reflects off of us, yet we are not shiny, nor can people see themselves in us. This is because: -> our surface is uneven and we generate diffusive reflection
2. The image distance of a virtual image is -> can be either
3. Light moves from air, into a box and then back out into air again. The refractive index of air is lower than that of the box. How is the light bent? -> first towards the normal, then away from the normal
4. We're told to shine a laser pointer onto a block of Lucite plastic in such a way that it neither enters the Lucite block, nor reflect off of it. We submerge the block in a liquid with a refractive index of 2, and the refractive index of Lucite is 1.51. At what angle should we shine the laser pointer to accomplish our mission? Hint: find the critical angle. -> 49°
5. We place a box that is 5 cm tall some 20 cm away from a concave mirror with a radius of curvature of 50 cm. What is the image height of the resulting image? -> 5 cm
6. Movie projectors use lenses to project an image onto a screen. What kind of image do the movie projector lenses have to produce in order for movie-goers to see an image on the screen? -> an upside down image
7. What is total internal reflection? -> Light hits an object at just the right angle that it can't refract out and instead reflects within.
8. The angle of incidence equals the angle of reflection in what kind of mirror? -> plane mirror
9. When light hits an object of a different refractive index it will -> change speed only
10. What kind of a mirror should we use to see a smaller, right side up version of ourselves? -> a convex mirror

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