Assertion (A): The focal length of the convex mirror will increase, if the mirror is placed in water.
Reason (R): The focal length of a convex mirror of radius R is equal to, f = R/2 .
Answer
Here,
-
Focal length
of the spherical mirror does
not depend
on the
medium
in which it is placed.
Thus, focal length of convex mirror will remain the same.
- For spherical mirrors, Focal length = (Radius of Curvature/2)
Thus,
- Assertion is false
- Reasoning is true
So, the correct answer is (d)