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A convex lens is dipped in a liquid whos...

A convex lens is dipped in a liquid whose refractive index is equal to the refractive of the lens. Then its focal length will

A

become zero

B

become infinite

C

remain small, but non-zero

D

remain unchanged

Text Solution

Verified by Experts

The correct Answer is:
B
When refractive index of lens is equal to the refractive index of liquid, the lens behave like a plane surface with focal length infinity.
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NCERT FINGERTIPS ENGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-MULTIPLE CHOICE QUESTIONS
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  10. A real image of a distant object is formed by a plano-convex lens of i...

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  11. An object is placed at a distance of 1.5 m from a screen and a convex ...

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  12. The image of a needle placed 45 cm from a lens is formed on a screen p...

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  13. A tree is 18.0 m away from 2.0 m high from a concave lens. How high i...

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  14. A luminous object is separated from a screen by distance d. A convex l...

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  18. A double convex lens made of glass of refractive index 1.56 has both r...

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  19. The power of a biconvex lens is 10 dioptre and the radius of curvature...

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