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A double convex lens is immersed in wate...

A double convex lens is immersed in water . Its focal length

A

Increases

B

Remains the same

C

Decreases

D

Becomes zero

Text Solution

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The correct Answer is:
A
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(i) If f = 0.5 m for a glass lens, what is the power of the lens? (ii) The radii of curvature of the faces of a double convex lens are 10 cm and 15 cm. Its focal length is 12 cm. What is the refractive index of glass? (iii) A convex lens has 20 cm focal length in air. What is focal length in water? (Refractive index of air-water = 1.33, refractive index for air-glass = 1.5.)

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