Please answer the following question with explanation
Asked by kkudgiri55
20th October 2018,
6:58 PM
Answered by Expert
Answer:
WE have lens makers formula :- P = 1/f = (μ-1) [ (1/R1) - (1/R2) ] .....................(1)
where P is power of lens if focal length f is expressed in metre, μ is refractive index of material and Rs are radii of curvature.
using(1) and given data, -8 = (1.5-1)[ (1/R1) - (1/R2) ] ........................(2)
when the lens is kept in a liquid of refractive index, then effective refractive index becomes (1.5/1.6)
then we write eqn.(1) with new refractive index and modified power p as , P = [ (1.5/1.6) -1][ (1/R1) - (1/R2) ].........................(3)
dividing eqn.(3) by eqn.(2), we get, 
Answered by Expert
21st October 2018,
1:17 AM
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