What is the main purpose of a lens?

• To reflect light
• To absorb light
• To refract light
• To block light

What is lens made of?

• Metal
• Transparent material such as glass or plastic
• Stone
• Wood

Which type of lens is thicker in the middle than at the edges?

• Concave lens
• Convex lens
• Plane lens
• Biconcave lens

How does a lens differ from a mirror?

• Lenses refract light, mirrors reflect light
• Lenses absorb light, mirrors transmit light
• Lenses reflect light, mirrors absorb light
• Lenses block light, mirrors focus light

Focal length is a distance between the lens and the focus point.

State the image characteristics

• real, upright, magnified
• virtual, upright, magnified
• virtual, inverted, diminished
• real, inverted, diminished

The image formed by a diverging lens is always magnified, virtual, and upright.

What happens to light rays passing through the center of a thin lens?

• They continue in a straight line
• They converge
• They diverge
• They reflect

A convex lens can form both real and virtual images.

The image formed by a convex lens is always larger than the object.