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Find the focal length and nature of a le...

Find the focal length and nature of a lens which should be placed in contact with a lens of focal length 10 cm so that the power of the combination becomes 5 dioptre.

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MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
  1. An object of size 3 cm is placed 14 cm in front of a concave lens of f...

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  2. Two thin converging lenses of focal lengths 0.15 m and 0.30 m are held...

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  3. Find the focal length and nature of a lens which should be placed in c...

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  4. The image of a candle flame placed at a distance of 30 cm form a spher...

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  5. Find the power of a convex lens which forms a real and inverted image ...

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  6. Define the principal focus of concave mirror.

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  7. The radius of curvature of a spherical mirror is 20cm.What is its foca...

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  8. Name a mirror which can give an erect and enlarged image of an object

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  9. Why do we perfer a convex mirror as back view mirror in vehicles?

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  10. Find the focal length of convex mirror whose radius of curvature is 32...

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  11. A concave mirror produces three times magnified real image of an objec...

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  12. A ray of light travelling in air enters obliquely into water. Does the...

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  13. Light enters from air to glass having refractive index 1.50 what is sp...

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  14. Find out from table 10.3 of the text-bool, the medius having highest o...

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  15. Refractive indices of kerosene,turpentine and water are 1.44, 1,47 and...

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  16. The refractive index of diamond is 2.42.What is the meaning of this st...

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  17. Define 1 dioptre of power of a lens

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  18. A convex lens from a real and inverted image of a needle at a distance...

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  19. Find the power of a concave lens of focal length 3 m.

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  20. Which one of the following material cannot be used to make a lens?

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