The eye

Which of the following parts of the eye controls the size of the pupil?

• Eyelashes

• Eye muscle

• Lens

• Iris

• The eye opened and then closed.

• The eye focused on a near object.

• The person walked into a dark room from a shiny place.

• A bright light was shone into the eye.

The image formed on the retina

(1) is inverted.

(2) is upright.

(3) has the same size as the object.

• (1) only

• (2) only

• (3) only

• (1) and (3) only

Which of the following is the correct sequence of steps taken when you seeing an object?

(1) The light-sensitive cells convert imaged formed on the retina into signals.

(2) Light rays from different points of the object enter the eye.

(3) Signals are transmitted to the brain.

(4) Light rays are focused on the retina.

• 2, 1, 4, 3

• 2, 4, 1, 3

• 4, 2, 1, 3

• 4, 1, 2, 3

• It becomes thinner.

• It becomes thicker.

• It moves away from the retina.

• It moves towards the retina.

A person first looks at a distant object and then reads a book. Which of the following graphs best represents the change in thickness of his/her lens during the process?

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