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A near point of hypermetropic person is ...

A near point of hypermetropic person is 50 cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 cm from the eye?

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BINA LIBRARY-Optics-I-EXERCISE
  1. A ray of light passes through an equilateral prism such that the angle...

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  2. An astronomical telescope of magnifying power 10 consists of two thin ...

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  3. A near point of hypermetropic person is 50 cm from the eye. What is th...

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  4. An astronomical telescope uses two lenses of powers 10 dioptre and 1 d...

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  5. The focal length of a convex lens of R.I. 1.5 in air is 2 cm. The foca...

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  6. Time taken by sunlight to pass through a window of thickness 4 mm whos...

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  7. Radius of curvature of a convex mirror is 40 cm and the size of the ob...

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  8. A convex lens has a focal length f. It is cut into two parts along a l...

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  9. Two thin lenses of focal lengths f1, and f2 are placed co-axially in ...

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

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  11. The magnifying power of a telescope is m. If the focal length of the e...

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  12. When red glass is heated in a dark room it seems

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  13. Focal length of a convex lens will be maximum for

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  14. Rainbow is due to a combination of

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  15. An astronaut in a spaceship sees the sky as

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  16. The sky looks blue due to-

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  17. A convex lens of focal length 0.5 m and a concave lens of focal length...

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  18. An enlarged virtual image can be obtained only in

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  19. A convex mirror gives images which are

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  20. A vitrual image larger than the object can be produced by

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