lenses & refraction

A converging lens is also known as a ____ lens.

• convex
• concave
• double
• refracted

What does the word "diverging" mean?

• to spread apart
• to come together
• parallel
• perpendicular

The point where the rays meet is known as....

• Fire
• the focal point
• refraction
• Plane of the lens

a real image...

• is produced by virtual rays and can be projected on a screen
• is produced by real rays and cannot be projected on a screen
• is produced by virtual images and cannot be projected on a screen
• is produced by real rays and can be projected on a screen

Which describes a convex lens?

• triangular in shape
• more transparent in the middle
• thicker on the edges than in the middle
• thicker in the middle than on the edges

What type of lens do humans have in their eyes? 

• Concave Lens 
• Convex Lens 

What type of image is formed when rays of light actually intersect?

• real
• virtual
• projected
• curved

Why does light refract when it encounters the glass in a lens?

• because it speeds up, which causes it to bend

• because it slows down, which causes it to bend

• because it hits a dense medium, which causes it to bounce off

• because it gets absorbed, which causes it to lessen in intensity

As light travels from air to water to glass, it will refract. The best explanation for this would be

• Glass is less transparent than water, which is less transparent than air.

• Light will be transmitted into the new medium each time it reaches a boundary.

• A light wave reflects off molecules as it travels, this causes the light to bend.

• The speed of a wave slows as it travels at different speed in different media.

How does a concave lens differ from a convex lens?

• A convex lens is another way to describe a plane mirror; a concave lens is curved

• A concave lens is curved inward on both sides; a convex lens is on only one side

• A convex lens has a thick center and thin edges, a concave lens has a thin center and thicker edges

• A convex lens has a thin center and thick edges. a concave lens has a thick center and thinner edges