Question

1. What kind of lens is present in the human eye ?

2. Name two parts of the eye which refract light rays (or bend light rays).

3. Name the part of the eye :

(a) which controls the amount of light entering the eye.

(b) on which the image is formed.

(c) which changes the focal length of eye-lens.

4. What is the name of :

(a) the curved, transparent front surface of the eye ?

(b) the light-sensitive layer in the eye ?

5. Where is the image formed in a human eye ?

6. What is the function of the lens in the human eye ?

7. What job does the pupil of the eye do ?

8. How does the eye adjust to take account of an increase in brightness ?

9. Name that part of the eye which is equivalent to the photographic film in a camera.

10. Name the part of the retina which is insensitive to light.

11. Which part of the eye contains cells which are sensitive to light ?

12. Name two types of cells in the retina of an eye which respond to light.​

Answer 1

1. The human eye contains a crystalline lens.

2. Two parts of the eye that refract light rays are the cornea and the lens.

3. (a) The iris controls the amount of light entering the eye.

(b) The retina is the part on which the image is formed.

(c) The ciliary muscle changes the focal length of the eye lens.

4. (a) The curved, transparent front surface of the eye is called the cornea.

(b) The light-sensitive layer in the eye is called the retina.

5. The image is formed on the retina in a human eye.

6. The lens in the human eye focuses light onto the retina, helping to form a clear image.

7. The pupil of the eye controls the amount of light entering the eye by adjusting its size.

8. The eye adjusts to an increase in brightness by constricting the pupil to reduce the amount of light entering the eye.

9. The retina in the human eye is equivalent to the photographic film in a camera.

10. The fovea is a part of the retina that is insensitive to light.

11. The retina contains cells called photoreceptors that are sensitive to light.

12. The two types of cells in the retina that respond to light are rods and cones.

Answer 2

The lens present in the human eye is a crystalline lens.
Two parts of the eye that refract or bend light rays are the cornea and the lens.
(a) The part of the eye that controls the amount of light entering is the iris.
(b) The image is formed on the retina.
(c) The ciliary muscles change the focal length of the eye lens.
(a) The curved, transparent front surface of the eye is the cornea.
(b) The light-sensitive layer in the eye is the retina.
The image is formed on the retina in a human eye.
The lens in the human eye helps focus light onto the retina, allowing us to see objects clearly at various distances.
The pupil of the eye regulates the amount of light that enters the eye by adjusting its size.
The eye adjusts to increased brightness by constricting the pupil to limit the amount of light entering the eye.
The part of the eye equivalent to the photographic film in a camera is the retina.
The part of the retina that is insensitive to light is the optic disc, also known as the blind spot.
The part of the eye that contains cells sensitive to light is the retina.
Two types of cells in the retina of an eye that respond to light are rods and cones.