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A plano-convex lens is made of a materia...

A plano-convex lens is made of a material of refrative index `mu=1.5`.The radius of curvature of curved surface of the lens is 20 cm.If its plane surface is silvered,the focal length of the silvered lens will be

A

10 cm

B

20 cm

C

40 cm

D

80 cm

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. A luminous object is placed at a distance of 30 cm from the convex len...

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  2. A lens having focal length f and aperture of diameter d//2 in the cent...

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  3. A plano-convex lens is made of a material of refrative index mu=1.5.Th...

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  4. The radius of curvatrure of a thin plano-convex lens is 10 cm (of cur...

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  5. A convex lens is dipped in a liquid,whose refrctive index is equal to ...

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  6. If a convex lens of focal length 80 cm and a concave lens of focal len...

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  7. A convex lens and a concave lens ,each having same focal length of 25 ...

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  8. Two thin lenses of focal length f1 and f2 are in contact and coaxial.T...

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  9. A beam of light composed of red and greeen ray is incident obliquely a...

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  10. A ray light is incident on a 60^@ prism at the minimum deviation posit...

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  11. The refracting angle of a prism is 60^@ nd the refractive index of the...

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  12. A ray is incident at an angle of incidence i on one surface of a prism...

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  13. The refractive index of the amterial of a prism is sqrt2 and its refra...

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  14. The focal length of a coverging lens is measured for violet,green and ...

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  15. If fv and fr are the focal lengths of a convex lens fro violet and red...

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  16. Rainbow is formed due to combination fo

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  17. For relaxed eye,magnifying power of a microscope is

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  18. An astronomical telescope of ten fold angular magnification has a leng...

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  19. Which one off the following phenomena is not explained by Huygens' con...

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  20. Ratio of intensity of two waves is given by 4:1. Then, ratio of the am...

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