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.