A convex lens of focal length 25 cm and a concave lens of focal length 10cm
Placed closed in contact with each other calculate the power
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we know that in a convex lens the focal length is positive and in concave lens it is negative so
in convex lens f= 25cm and
concave lens f = -10
= focal length of con vex + concave lens
=25-10 = 15cm
but power is inversely proportional to 1m of focal length so we should convert 15 cm to meters
= 0.15 m = 1/0.15
= 6.6 D = power
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