Question

(a) Draw a diagram to show the formation of image of a distant object by a myopic eye. How can such an eye defect be remedied? 

(b) State two reasons due to which this eye defect may be caused.

(c) A person with a myopic eye cannot see objects beyond a distance of 1.5 m. What would be the power of the corrective lens used to restore proper vision?

Answer 1

(a) Object at infinity, image is formed in front of retina.

Corrected by concave lens

(b) Myopia is caused due to: 

(i) Elongation of eye ball 

(ii) Excessive curvature in cornea, focal length decreases. 

(c) Far point of myopic eye is 1.5 m 

= v to change far point to infinity 

= u focal length of power → P = ?, F = ?