Draw a diagram to show why distant objects cannot be seen distinctly by a myopic eye. List two reasons due to which this defect of vision may be caused. A person with a myopic eye cannot see objects clearly beyond a distance of 2 m. Name the type of the corrective lens that would be needed to correct the defect of vision and draw a ray diagram to show how the defect gets corrected.

1. Why Distant Objects Cannot Be Seen Distinctly by a Myopic Eye

In a myopic eye, the light rays coming from a distant object (at infinity) are focused in front of the retina rather than on the retina itself. This results in a blurred image of distant objects.

2. Two Causes of Myopia

Myopia is caused due to:

1. Excessive curvature of the eye lens: The lens becomes too thick, decreasing its focal length and increasing its converging power.
2. Elongation of the eyeball: The distance between the eye lens and the retina increases, so the image is formed in front of the retina.

3. Corrective Lens and Ray Diagram

To correct a myopic eye with a far point of $2\text{ m}$, a concave lens (diverging lens) of suitable power is required.

The concave lens diverges the parallel rays of light coming from a distant object so that they appear to diverge from the far point ($F$) of the myopic eye. The eye lens then converges these rays to form a sharp image on the retina.