Question:
A thin glass lens has optical power -5D in air.it optical power in a liquid with refractive index 1.6 will be
Answer:
Power of lens in air = -5 D
The refrective index of a thin lens glass,μg = 1.5
Refrective index of liquid,μl =1.6
Using lens maker formula-
1. For lens placed in air-
P1 = (μg -1)[1/R1 - 1/R2]
= (1.5 -1)[1/R1 - 1/R2] = -5
So, [1/R1 - 1/R2] = -10 .......(1)
2. For lens placed in liquid-
P2 = (μg /μl -1)[1/R1 - 1/R2]
Put the value from eq. (1)
= (1.5/1.6 -1)[-10]
= 0.625 D
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