Lenses Quiz part 1

What type of mirror forms a virtual image?

• Spherical mirror

• Convex mirror

• Plane mirror

• Concave mirror

Which lens forms an upright and smaller image?

• Concave lens

• Convex lens

• Plane mirror

• Convex mirror

Where is the image formed when an object is at the center of curvature of a convex lens?

• At the focus

• At the optical center

• At the center of curvature

• At the pole

Which of the following is NOT a use of lenses?

• Flashlights

• Binoculars

• Medical glasses

• Cameras

What type of lens is a concave lens?

• Converging lens

• Reflecting lens

• Diverging lens

• Collecting lens

What is true about a convex lens?

• Does not collect light

• Thin at the center

• Thick at the center

• Diverges light rays

What is the principal axis of a lens?

• The focal length

• The line through the centers of curvature

• The radius of curvature

• The optical center

If the focal length of a concave lens is 6 cm, what is the radius of curvature?

• 12 cm

• 3 cm

• 9 cm

• 6 cm

What happens to a light ray passing through the optical center of a convex lens?

• It passes without refraction

• It diverges

• It passes through the focus

• It reflects

If a convex lens has a focal length of 20 cm and an object is placed at 40 cm, where is the image formed?

• 40 cm

• 20 cm

• 10 cm

• 5 cm