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Q.

An air bubble in sphere having 4 cm diameter appears 1 cm from surface nearest to eye when looked along diameter. If  aμg =1.5, the distance of bubble from refracting surface is

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a

1.2 cm

b

3.2 cm

c

2.8 cm

d

1.6 cm

answer is A.

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Detailed Solution

v=1cm,  R=2 cmBy  using  μ2v−μ1u=μ2−μ1R1−1−1.5u=1−1.5−2⇒u=−1.2  cm
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An air bubble in sphere having 4 cm diameter appears 1 cm from surface nearest to eye when looked along diameter. If  aμg =1.5, the distance of bubble from refracting surface is