A thin convex lens is made with glass of refrective index 1.5 and it's focal length is 0.2m if it is acts as a concave lens of focal length 0.5m when dipped in a liquid then the refractive index of the liquid is a. 17/8 b. 15/8 c.13/8. d. 9/8
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Answer:
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Explanation:
μ
1
=1.5
f
1
=0.2m
f
2
=(−0.5)
μ
2
=?
Using lens makers formula and taking ratios,
f
2
f
1
=
(μ
1
−1)
(μ
2
−1)
⇒
(−0.5)
0.2
=
(1.5−1)
(
μ
e
1.5
−1)
⇒
0.5
0.2×0.5
=(1−
μ
e
1.5
)
⇒
μ
e
1.5
=0.8
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