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A concave mirror and a convex lens are o...

A concave mirror and a convex lens are of the same focal length in air. When they are immersed in water

A

the concave mirror will have its focal length increased

B

the convex lens will have its focal length increased

C

they will have equal focal lengths, different from those in air

D

they will have equal focal lengths, same as those in the air.

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The correct Answer is:
B
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MOTION-RAY OPTICS-Exercise-2
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  10. A thin symmetrical double convex lens of power P is cut into three par...

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  11. A thin linear object of size 1mm is kept along the principal axis of a...

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  12. A concave mirror and a convex lens are of the same focal length in air...

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  13. A convex lens of focal length 10 cm is in contact with a concave lens....

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  14. A concave spherical surface of radius of curvature 10 cm separates two...

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