Given,
power of lens p = 25 D
focal length is unknown f = ?
We know that the formula of power is
p= 1/ f
f = 1/p
f = 1/25
f = 0.04 m
converting it into cm for numerical purpose.
f = 0.04 * 100 cm
f = 4 cm.
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A hand lens has 25D. Where should the lens be kept to read the letters of book?
Given,
power of lens p = 25 D
focal length is unknown f = ?
We know that the formula of power is
p= 1/ f
f = 1/p
f = 1/25
f = 0.04 m
converting it into cm for numerical purpose.
f = 0.04 * 100 cm
f = 4 cm.
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