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Focal length of a convex lens of refract...

Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when immersed in a liquid of refractive index 1.25 will be

A

5 cm

B

2.4 cm

C

1 cm

D

4 cm

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The correct Answer is:
A
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MOTION-RAY OPTICS-Exercise-1
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  2. A thin lens is made with as material having refractive index mu=1.5. b...

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  3. Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal l...

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  4. The focal length of a plano-convex lens is equal to its radius of curv...

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  5. A convex lens of focal length f will form a magnified real image of an...

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  6. IMAGE FORMATION FROM CONCAVE LENS

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  7. A lens of power +2 dioptres is placed in contact with a lens of powe...

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  8. When two thin lenses are kept in contanct, the focal length of the com...

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  9. A thin convex lens of focal length 10 cm and a thin concave lens of f...

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  10. A convex lens of focal length A and a concave lens of focal length B a...

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  11. When a thin convex lens is put in contact with a thin concave lens of ...

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  12. If I(1) and I(2) be the size of the images respectively for the two po...

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  13. A convex lens forms a real image on a screen placed at a distance 60 c...

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  14. A plano-convex lens when silvered on the plane side behaves like a con...

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  15. The plane surface of a plano-convex lens of focal length f is silvered...

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  16. A concave lens of focal length 25 cm and a convex lens of focal length...

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  17. Two lenses of power +2.50D and -3.75D are combined to form a compound ...

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  18. Lenses of powers 3D and -5D are combined to from a compound lens. An o...

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  19. An object placed at a distance of a 9cm from the first principal focus...

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  20. A convex lens of Focal length of 40cm is in contact with a concave len...

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