5) Lenses

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

Tags

NGSS.MS-PS4-2

_____ lenses refract light rays in toward a central point. When this lens is held close to your eye, the image is magnified and right side up.

• Concave

• Convex

• Prismatic

• Refractive

Sara is using a magnifying glass to closely examine her stamp collection. Which type of lens is found in a magnifying glass.

• bifocal

• concave

• convex

• prismatic

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

What do a prism, a magnifying glass, a microscope, and eyeglasses ALL have in common.

• They are opaque

• They refract light

• They reflect light

• That are translucent

A ____ lens is sometimes called a converging lens because it_____.

• convex; makes parallel light rays curve outward or diverge

• concave; makes parallel light rays travel at a faster speed than before they encountered the lens

• convex, makes parallel light rays passing through it bend inward and meet (converge) at a spot just beyond the lens known as the focal point.

• concave; makes parallel light rays passing through it bend inward and meet (converge) at a spot just beyond the lend known as the focal point.

Which image CORRECTLY shows how light behaves when it travels from air through glass?

• 
• 
• 
• 

Tags

NGSS.MS-PS4-2

A concave lens has an inward curved shape. It refracts light outward from the lens. They light rays spread apart as they exit the lens. Which represents a concave lens?

• A

• B

• A and B

• neither A or B

Eyeglasses bend light to help the image form properly on the retina. The bending of light as it passes from one medium to another is called

• diffraction

• interference

• reflection

• refraction

Tags

NGSS.MS-PS4-2