Assertion :A double convex lens (μ=1.5) has focal length 10 cm. When immersed in water (μ=4/3),its focal length becomes 40 cm. Reason: 1f=μl−μmμm(1R1−1R2)
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion The focal length of the lens when it is immersed in water is 4 times than the focal length of the lens in air. i.e., fwater=4fair