Questions
A man who cannot see clearly beyond 5 m wants to see stars clearly. He should use a leas of focal length
a
- 100 m
b
+5 m
c
-5 m
d
Very large
detailed solution
Correct option is C
For lens u=wants to see = ∞; v=can see =−5m∴From 1f=1v−1u⇒1−5=1∞⇒f=−5 m.Talk to our academic expert!
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