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A converging lens of refractive index 1.5 kept in a liquid medium having the same refractive index. What would be the focal length of the lens in this medium? |
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Answer» Answer: REFRACTIVE INDEX of the LENS = 1.5 =Refractive index of MEDIUM the lens in a medium (liquid) will be act LIKE a plane of glass. Its focal length will be infinte By using the formula of lens maker. 1/f = (u - 1) (1/R1 - 1/R2) 1/f = (u2/u1 -1) (1/R1 - 1/R2) u1 = u2 1/f = 0 thus, f = infinity |
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