a convex lens of focal length 20cm is placed in contact with a concave lens of focal length 12.5cm in such a way that they have a same principal axis find the power of combination.
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Explanation:
power of lens =100/20 - 100/12.5 P= 5 - 8 P=
- 3 D Therefore , power of lens - 3 D
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convex lens of focal length 20cm is placed in contact with a concave lens of focal length 12.5cm in such a way that they have a same principal axis find the power of combination.
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