doctor advice a person to use -1. 5 D lens what is the focal length of lens and what type of lens is that?
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Answer:
Power of lens= Reciprocal of Focal Length
Focal length= Reciprocal of Power of lens
F=1/-1.5
F=10/-15
F=2/-3
F= -0.667m
Since the power of the lens is in negative, the lens is concave lens.
Explanation:
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