Question

a convex length of focal length is 10c.m and concave lens of focal length is 20c.m are placed in contact find the power of the equivalent lens
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Answer 1

Answer:

the power is reciprocal of the which focal length is combined when the power of lens is equal to to 1 by X + 21 is equal to 1 by 30 then the power cell is equal to 1 by 30

Answer 2

Explanation:

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