4. Find the focal length of a lens of donar-20D. what type of lens in this
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We are given the power of lens =20D
And focal length is f = 1/P
Therefore...... Focal length is
f = 1/20
= - 0.05m or - 5 cm
Since power is negative... Focal length will be negative..... Therefore this is a concave lens.....
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