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What is the focal length of a double con...

What is the focal length of a double convex lens for which radius of curvature of the surfaces is 40 cm and refractive index of the glass is 1.5?

A

50 cm

B

40 cm

C

`-30 cm`

D

`-40 cm`.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. A diver in swimming pool wants to signal his distress to a person lyin...

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  2. An equiconvex lens has focal length equal to the radius of curvautre.I...

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  3. What is the focal length of a double convex lens for which radius of c...

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  4. A lens behaves as a converging lens in air and diverging lens in wate...

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  5. The two surfaces of a convex lens are of same radius of curvature.It i...

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  6. The two surfaces of a convex lens are of same radius of curvature.It i...

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  7. A convex lens is placed in contact with a mirror as shown in figure. I...

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  8. For a given distance between an object and an image screen,magnificati...

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  9. An object is placed at a distance of f//2 from a convex lens .The imag...

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  10. A camera is focussed to take a cose up picture of an insect at a dista...

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  11. The graph drawn with object distance along abbscissa and image distanc...

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  12. Two plane -convex lenses,each having focal length of 0.4 m,are pressed...

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  13. A film projector magnifies a 100 cm^2 film strip on a screen.If the li...

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  14. In order to include the effect of thickness t of the lens,following f...

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  15. A beam of light is incident on a convex lens parallel to its principal...

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  16. The plane face of the plano-convex lens of focal length 20 cm is silve...

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

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  18. A beam of parallel rays is brought to focus by a plano-convex lens.A ...

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  19. Large aperture of lens results in

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  20. The spherical abberation in a lens may be inimised by designing of th...

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