Convex and Concave Lenses

What is the name given to a lens formed by arranging two prisms with rectangular rough surfaces facing each other?

• Convex lens

• Concave lens

• Diverging lens

• Converging lens

What happens to parallel rays incident on a convex lens?

• They refract away from the center

• They undergo maximum refraction at the top and bottom

• They undergo no refraction at the center

• They converge at a point

What is the center of the curvature of a convex lens called?

• Focal point

• Optical center

• Center of curvature

• Principal axis

What is the focal length of a lens?

• The distance between the optical center and the focal point

• The distance between the two prisms in a lens

• The radius of curvature of the lens

• The distance between the parallel rays incident on the lens

Which lens has a shorter focal length, a thick lens or a thin lens?

• Thick lens

• Thin lens

• Both have the same focal length

• It depends on the diameter of the lens

What type of image is formed by a convex lens?

• Real image

• Virtual image

• Inverted image

• Enlarged image

What can happen if you look directly at the Sun through a convex lens?

• The lens will break

• The lens will become cloudy

• The lens will heat up and burn

• The lens will become discolored

What happens to parallel rays incident on a concave lens?

• They refract away from the center

• They undergo maximum refraction at the top and bottom

• They undergo no refraction at the center

• They converge at a point

What is the name given to the point where divergent rays appear to meet after passing through a concave lens?

• Focal point

• Optical center

• Center of curvature

• Principal axis

What type of image is formed by a concave lens?

• Real image

• Virtual image

• Inverted image

• Enlarged image