If power of a lens is 0.25D,find the focal length
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Answered by
15
Power of lens = 0.25D
Power is positive, therefore, the given lens is convex.
Let focal length be F
∴Power of lens = 1/F
0.25 = 1/F
F = 1/0.25
F = 4m
Power is positive, therefore, the given lens is convex.
Let focal length be F
∴Power of lens = 1/F
0.25 = 1/F
F = 1/0.25
F = 4m
Answered by
7
Answer :-
Power = - 0.25 D
1/f ( in metres ) = - 0.25
F = 1/- 0.25
= 100/ -25
= - 4 m
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