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42 Cards in this Set

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does not let light pass through

opaque

clear; allows light to pass through

transparent

allows light to pass through, but scatters the light

translucent

able to produce its own light

luminous

the bouncing back of light

reflection

a two-sided piece of transparent material with one or both sides curved

lens

a lens that is thicker at the edges than in the middle, making things look smaller

concave lens

a lens that is thicker in the middle than at the edges, making things look larger

covex lens

to gather together in one place

focus

the bending of light rays as they enter a new material

refraction

a transparent object that separates the colors in white light by bending them at different angles

prism

the series of colored bands created when sunlight is separated

spectrum

invisible light beyond the red end of the spectrum; heats the object it strikes

infrared light

the light-sensitive lining at the back of the eyeball

retina

the opening in the iris through which light enters the eye

pupil

the colored part of the eye that surrounds the pupil and regulates its size

iris

the transparent, outer layer at the front of the eyeball

cornea

an extra layer of cells behind the retina of many nocturnal animals

tapetum

Light naturally travels around corners. T/F

false

Shadows are made when light is blocked by an object. T/F

true

Translucent materials allow you to see light but not objects through them. T/F

true

A microscope is used to make far away objects seem closer. T/F

false

A telescope is used to make small objects seem larger. T/F

false

Mirrors are used in periscopes to enable their users to see around corners. T/F

true

Nearsighted people need lenses that are convex. T/F

false

Ultraviolet light causes tanning or sunburn. T/F

true

Insects use their compound eyes to detect movement in any direction. T/F

true

An animal with binocular vision can see two images at the same time. T/F

false

Who is the Creator of all light?

God

What travels faster than anything else scientists can measure?

light

What is the speed of light?

186,000 miles per second

What do we call the luminous objects we see in God's creation?

natural lights

Why do leaves look green?

They absorb all other colors in light and reflect green.

What is the ability to do work?

energy

Which mirror focuses light rays, causing the reflected oject to look bigger?

concave mirror

Who invented the incandescent light bulb?

Thomas Edison

Who discovered tht white light is a mixture of colored light?

Sir Isaac Newton

Which mirror scatters light rays, causing the reflected object to look smaller?

convex mirror

Why do you see the flash of lightning before you hear the clap of thunder?

because light travels faster than sound

If you shine a flashlight into the night sky, how fast will its light travel?

approximately 186,000 miles per second

Why can you see a red-colored light coming from the heating element of an operating toaster?

The element gives off light because it is very hot.

Why can't you see your face in a chalkboard?

The chalkboard is not a good reflector because it has a dull, rough surface.