(a) What happens to the size of pupil of our eye (i) in dim light (ii) in bright light?
(b) Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.

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Solution

(a) The size of the pupil of our eye
(i) becomes large in dim light so as to accommodate more light in the eyes
(ii) becomes small in bright light so that very little light enters the eye

(b) The cells on the retina of the eye that are sensitive to
(i) bright light: cones (cone-shaped cells)
(ii) dim light: rods (rod-shaped cells)
(iii) colour: cones

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Q. Statement I: Cones are sensitive to bright light.
Statement II: Rods are sensitive to dim light.

Question 7

Which of the following statements is correct regarding rods and cones in the human eye?
(a) Cones are sensitive to dim light
(b) Cones are sensitive to bright light
(c) Rods are sensitive to bright light
(d) Rods can sense colour

12. Retina of Human Eye is made of two kinds of cells. Which of the following statements are true with respect to the same ?

1. Rods are the cells which are sensitive to the bright light and colour.

2. Cons are the cells which are sensitive to the dim light.

Q. Out of rods and cones m the retina of your eye:
(a) which detect colour?
(b) which work in dim light?

Q. What will happen if our eyes are exposed to very dim light?

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(a) What happens to the size of pupil of our eye (i) in dim light (ii) in bright light? (b) Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.

(a) What happens to the size of pupil of our eye (i) in dim light (ii) in bright light?
(b) Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.