Convex vs. Concave lenses

In a convex lens light rays are refracted in a way that causes them to

• come together

• spread apart

• continue in a straight line

A concave lens refracts light in a way that causes light rays to 

• come together

• spread out

• continue in a straight line

Which lens is shaped like a football?

• concave lens

• convex lens

The principle focus is always on the axis of the lens which is located 

• at the top of the lens

• in the middle of the lens

• at the bottom of the lens

Making a lens more curved, thereby decreasing the focal length, can make it more powerful.

• True

• False, less powerful

Images form where light rays appear to 

• come together

• spread apart

• continue in a straight line

The convex lens in your eye creates real images on the retina at the back of the eye that are right-side up.

• True

• False, inverted

Mirrors are examples of using light to create

• real images

• virtual images

What type of lens refracts light in a way that creates a real, inverted, and smaller image?

• convex lens

• concave lens