Think you’ve got your head wrapped around Optics? Put your knowledge to
the test. Good luck — the Stickman is counting on you!
Q. 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 specular reflection
because we wear clothes
our surface is smooth and we generate specular reflection
our surface is smooth and we generate diffusive reflection
our surface is uneven and we generate diffusive reflection
Q. The image distance of a virtual image is
always positive
always negative
can be either
depends on whether the image is generated by reflection or refraction
depends on whether the image is upside down or right side up
Q. 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
first away from the normal, then towards the normal
towards the normal in both cases
away from the normal in both cases
it gets totally internally reflected
Q. 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.
90°
45°
49°
15°
0°
Q. 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?
25 cm
5 cm
-25 cm
10 cm
-5 cm
Q. 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?
a virtual image
an upside down image
a specular image
a magnified, virtual image
a real image
Q. What is total internal reflection?
Light hits an object at just the right angle so that it travels straight through it.
Light hits an object at just the right angle that it can't refract out and instead reflects within.
Light hits an object at an angle so that the angle of incidence is equal to the angle of reflection.
Light hits an object so that it is bent by exactly 45°.
Light is completely absorbed by an object.
Q. The angle of incidence equals the angle of reflection in what kind of mirror?
plane mirror
car mirror
concave mirror
convex mirror
shaving mirror
Q. When light hits an object of a different refractive index it will
change speed only
change direction only
change speed and direction
continue unimpeded
disappear
Q. What kind of a mirror should we use to see a smaller, right side up version of ourselves?
a convex mirror
a concave mirror
a plane mirror
there is no such mirror
there are both convex and concave mirrors that will do this