First slide

Ray optics

Question

A concave mirror is held in water. What should be the change in the focal length of the mirror?

Easy

A

Halved
B

Doubled
C

Remains the same
D

Increases exponentially

Solution

No change. The focal length of a concave mirror does not depend on the nature of the medium. Therefore, the focal length of the mirror, even after holding it in water, will remain the same.

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