Understanding Light and the Eye

Which part of the eye controls the amount of light entering the eye?

• Retina

• Iris

• Cornea

• Lens

What is the transparent, curved front surface of the eye that helps to focus light?

• Retina

• Cornea

• Sclera

• Optic nerve

Which structure in the eye changes shape to focus on near or distant objects?

• Lens

• Iris

• Pupil

• Retina

What is the main function of the retina?

• To control the size of the pupil

• To focus light onto the lens

• To detect light and convert it into electrical signals

• To protect the eye

Which type of photoreceptor cell is responsible for seeing in dim light?

• Cones

• Rods

• Bipolar cells

• Ganglion cells

What is the main role of cones in the retina?

• Detecting movement

• Seeing in low light

• Detecting colour

• Focusing light

What happens to light as it passes through the lens of the eye?

• It is absorbed

• It is reflected

• It is refracted (bent)

• It is blocked

Where on the retina are the most cone cells found?

• In the centre

• Around the edges

• They are evenly spread out

What is the name of the opening in the centre of the iris through which light enters the eye?

• Lens

• Pupil

• Retina

• Cornea

Which of the following best describes the process of refraction in the eye?

• Light bouncing off the retina

• Light bending as it passes through different parts of the eye

• Light being absorbed by the iris

• Light being blocked by the pupil