Optics Question 630

Question: A thin lens made of glass of refractive index 1.5 has a front surface + 11 D power and back surface - 6 D. If this lens is submerged in a liquid of refractive index 1.6, the resulting power of the lens is

[SCRA 1994]

Options:

A) -0.5 D

B) + 0.5 D

C) - 0.625 D

D) + 0.625 D

Show Answer

Answer:

Correct Answer: C

Solution:

Total power P=P1+P2=116=5D

Also flfa=(aμg1)(lμg1)PaPl=(aμg1)(lμg1)

5Pl=(1.51)(1.5/1.61)Pl=0.625D



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