Lenses and Image Formation

What is the primary function of a lens in terms of light?

• To reflect light

• To completely block light

• To absorb light

• To focus or disperse light

What is the principal focus of a lens?

• The edge of the lens

• The center of the lens

• The thickest part of the lens

• The point where light rays converge or appear to diverge

What is another name for a convex lens?

• Diverging lens

• Concave lens

• Converging lens

• Plane lens

Which type of lens would you use to correct farsightedness?

• Cylindrical lens

• Convex lens

• Concave lens

• No lens is needed

How do concave lenses affect parallel rays of light?

• Reflect them back

• Absorb them completely

• Disperse them outwards

• Focus them to a point

What type of image is formed when light rays actually converge?

• Virtual image

• Real image

• Inverted image

• Upright image

How are virtual images different from real images?

• They can be projected on a screen

• They are always larger than the object

• They form where light rays appear to meet

• They form where light rays actually meet

Where does a real image form in the human eye?

• On the lens

• On the retina

• On the iris

• On the cornea

What is the role of the brain in viewing real images?

• It inverts them to make sense visually

• It changes their colors

• It enlarges them for clarity

• It stores them as memory

What is a common example of a virtual image?

• Shadows on the ground

• Reflections in a mirror

• Images on a cinema screen

• Photos on a camera