doctor advised to use -4d lens. find the focal length of lens in cm and also in metre. what can you infer about the nature of lens?
Answers
Answered by
1
Explanation:
power= -4D
power =1/focal length
=1/-4
= -0.25m
this lens is concave lens
Answered by
4
Explanation:
Given: P=-4 D.
F=1/P
F=1/-4=0.25m or 25cm
The (-) sign indicates that it is a concave lens.
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