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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 infinite

B

become small, but non-zero

C

remain unchanges

D

become zero

Text Solution

Verified by Experts

The correct Answer is:
A
`(1)/(f)=((mu)/(mu)-1)((1)/(R_1)-(1)/(R_2))impliesf=infty`
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CP SINGH-REFRACTION AT SPHERICAL SURFACES-EXERCISES
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  2. A lens of refractive index n is put in a liquid of refractive index n'...

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  6. In the above question if there is air in the object space and water in...

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  7. A convex lens is made of 3 layers of glass of 3 different materials as...

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  8. The focal length for violet, green and red light rays are fV,fG and fR...

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  9. An equiconvex lens is cut into two halves along (i) XOX^(') and (ii) Y...

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  10. If the central portion of a convex lens is wrapped in black paper as s...

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  11. A convex forms a real image of a poinnt object placed on its principal...

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  12. A thin lens focal length f(1) and its aperture has diameter d. It form...

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  13. A convex lens is made up of three different materials as shown in the ...

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  14. consider three congerging lenses L1, L2 and L3 having identical geomet...

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  15. A double convex lens made of a material of refractive index mu1, is pl...

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  16. A parallel beam of light is incident on a converging lens parallel to ...

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  17. A point source of light is placed at a distance of 2f from a convergin...

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  18. A thin lens, made of glass of refractive index 3//2, produces a real a...

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  19. A convex lens is used to form a real image of the object shown in the ...

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  20. A convex lens of focal length 16 cm forms a real image double the size...

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