Question

6..The radii of curvature of two surface of a double concave lens are 20cm and 40cm respectively and refractive index of the material of the lens is 1.60.The power of lens will be..​

Answer 1

Answer:

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Answer 2

Answer:

Here, R1=20cm,R2=-40cm,f=20cm,μ=? ∴120=(μ-1)(120+140)=(μ-1)340

Or,(μ-1)=23

Or,μ=23+1=53.

Here is your answer.

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