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CBSE Class 12-science Answered

a convex lens of focal length f is cut into two halves such that one surface of each is plane what is the focal length of each half
Asked by deepakphy93 | 03 Jan, 2018, 01:08: PM
answered-by-expert Expert Answer
lens-maker formula for focal length f of convex lens is given by
begin mathsize 12px style 1 over f space equals space open parentheses mu minus 1 close parentheses open parentheses 1 over R subscript 1 plus 1 over R subscript 2 close parentheses end style
μ is refractive index of material of lens, R1 and R2 are radius of curvature. If one side is flat, Radius of curvature will become infinity. Hence focal length f will become
begin mathsize 12px style 1 over f space equals space open parentheses mu minus 1 close parentheses open parentheses 1 over R subscript 1 close parentheses end style
 

Answered by | 03 Jan, 2018, 04:51: PM

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