Question

A man wear glasses of focal length $f=+1m.$

• A. If he is far-sighted
• B. If he is near-sighted
• C. If his vision is normal
• D. None of these

Answer 1

Answer: (A)

If he is far-sighted

Given,

Focal length of the glasses, $f=+1m$

For a convex lens, the focal length is always positive.

Hypermetropia is also known as farsightedness. A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly. This defect can be corrected by using a convex lens of appropriate power