Thin Lenses

Which letter represents the angle of incidence?

• A

• B

• C

• D

What is the angle of reflection?

• 65⁰

• 50⁰

• 25⁰

• 40⁰

What type of image is formed?

• virtual and inverted

• virtual and upright

• real and upright

• real and inverted

What type of lens is your eye?

• convex
• concave
• it is not a lens

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

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

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.

In the thin lens equation, do represents 

• Distance of the object from the lens
• Distance of the image from the lens

An object is located 35.0 cm from a convex lens. The lens forms a real image at a distance of 15.0 cm. What is the focal length?

• 0.0953 cm

• 10.5 cm

• 26.2 cm

• 0.0678 cm