A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
Focal length of lens immersed in water is four times the focal length of lens in air. It means \[{{f}_{w}}=4{{f}_{a}}=4\times 10=40\,cm\]You need to login to perform this action.
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