Question

40. Near point is to 2 metre to a man. Which of the following are true to him?
A he can see the objects within 2 metre distance
B. he can see the objects above 2 metre distance
C. he required biconvex lens
D. both b and c

please give right option​

Answer 1

Given:

Near point is to 2 metre to a man.

To find:

True statement among the following:

A he can see the objects within 2 metre distance

B. he can see the objects above 2 metre distance

C. he required biconvex lens

D. both b and c

Solution:

This is a case of

HYPERMETROPIA

• Since the near point has shifted to 2 m , the person can see objects which are placed away from the near point.

• Usual near point for a normal person is 25 cm.

• Hence , the affected person requires a bi-convex lens in-order to deviate the light rays(from object) adequately and get them focussed at the retina.

• Hence , this optical defect is called "Long-Sightedness"

Both b and c are correct.