Basic Concepts
What are some sources of light?
a. Sun
b. Flames
c. Lamps
d. All of the above
d. All of the above
What is the distance light travels in one year called?
a. light jump
b. light mile
c. lightyear
d. light second
c. Lightyear
Why do we see colors in objects?
a. because of reflection
b. because of absorption
c. both a and b
d. None of the above
c. Both a and b.
What type of mirror is flat and smooth, showing an upright image?
a. concave mirror
b. convex mirror
c. plane mirror
d. spherical mirror
c. Plane mirror
How does a convex mirror curve?
a. inward
b. outward
c. flat
d. curved
b. outward
Light waves can travel in a vacuum because:
a. They are particles
b. They are waves
c. They don't need a medium to travel.
d. They need a medium.
c. They don't need a medium to travel.
The speed of light is approximately:
a. 100,000 km/s
b. 500,000 km/s
c. 300,000 km/s
d. 1,000,000 km/s
c. 300,000 km/s
What happens when all light is absorbed by an object?
a. we see white
b. we see black
c. we see color
d. we see nothing
b. We see black
True or false: Opaque objects do not allow light to pass through.
True.
What is the function of a lens in a camera?
a. to gather and bend light
b. to form an image on film
c. to magnify objects
d. to reflect light
a. to gather and bend light
What are photons?
a. mass-less particles
b. light waves
c. sound waves
d. electromagnetic waves
a. Mass-less particles
If you could travel at the speed of light, how many times could you circle the Earth in one second?
a. 1 time
b. 3 times
c. 7 1/2 times
d. 10 times.
c. 7 1/2 times
Why do you feel warmer wearing black on a cold day?
a. black reflects heat
b. black absorbs light
c. black is a brihgt color
d. black repels cold.
b. Black absorbs light.
What part of the eye refracts light?
a. cornea
b. pupil
c. Iris
d. retina
a. Cornea
True or false: The optic nerve transmits signals to the brain.
True
Which statement about light is true?
a. It travels in curves.
b. It travels in a zigzag path.
c. It travels in a straight line.
d. It travels slower than sound.
c. It travels in a straight line.
What behavior of waves describes bouncing off of an object?
a. absorption
b. reflection
c. refraction
d. transmission
b. Reflection
What happens when light changes speed because it enters a different medium?
a. absorption
b. transmission
c. reflection
d. refraction
d. refraction
a. rods
b. cones
c. lenses
d. retinas
b. cones
What happens when light waves are refracted through water in the air?
a. absorption
b. reflection
c. diffraction
d. rainbows
D. rainbows
How long does it take for sun to reach the earth?
a. 8 minutes
b. 24 hours
c. 1 hour
d. 1 month
a. 8 minutes
What color do we see when we see all of the colors combined?
a. black
b. white
c. blue
d. red
b. White
How do rainbows form?
a. reflection
b. absorption
c. refraction
d. transmission
c. refraction
Which optical device uses lenses to magnify small objects?
a. telescopes
b. microscopes
c. cameras
d. binoculars
b. microscopes
What type of object forms a shadow?
a. transparent object
b. transluscent object
c. opaque object
d. reflective object
c. opaque object