1.

Assertion : If a convex lens of glass is immersed in water its power decreases. Reason : In water it behavesas a convex lens.

Answer»

If both the ASSERTION and reason are true statement andreason is correct explanation of the assertion .
If both the assertion and reason are true statement but reason is not a correct explanation of the assertion .
If the assertion is true but the reason is a false statement.
If both assertion and reason are false statements.

Solution :When a convex lens of light of glass ` (mu=3//2)` is immersed in water `(mu=4//3)` , its focal LENGTH increases. IT becomes 4 times.This reduces its power to one-fourth its previous value. But the nature of the lens is not changed in this case. When a lens isimmersed in MEDIUM whose refractive INDEX isgreater than that of the material of the lens , its nature reverses.


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