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Define 1 dioptre of power of a lens...

Define 1 dioptre of power of a lens

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…is the unit of power of the lens

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A convex lens is made of glass of refractive index 1.5. If radius of curvature of the each of its two surfaces is 20 cm, find the ratio of power , of lens when placed in air to its power, when immersed inside a liquid of refractive index 1.25 .

The unit of power of lens is…… .

A myopic adult has a far point at 0.1m. His power of accomodation is 4 dioptres What power lenses are required to see distant objects? (Take the image distance from the lens of the eye to the retina to be 2 cm).

MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
  1. Refractive indices of kerosene,turpentine and water are 1.44, 1,47 and...

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

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  3. Define 1 dioptre of power of a lens

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

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

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

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  7. The image formed by a concave mirror is observed to be virtual, erect ...

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  8. Where should an object be placed in front of a convex lens to get a re...

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  9. A spherical mirror and a thin spherical lens have each a focal length ...

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  10. No matter how far you stand from a spherical mirror, yours image appea...

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  11. Which of the following lenses would you prefer to use while reading sm...

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  12. We wish to obtain an erect image of an object, using a concave mirror ...

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  13. Name the type of mirror used in the following situation: head light of...

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  14. Name the type of mirror used in the following situation: Sider/rear-vi...

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  15. Name the type of mirror used in the following situation: Solar furnace

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  16. One half of a convex lens is covered with a black paper .Will this len...

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  17. An object 5 cm in length is held 25cm away from a converging lens of f...

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  18. A concave lens of focal length 15cm forms an image 10 cm from the lens...

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  19. An object is placed at a distance of 10 cm from a convex mirror of foc...

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  20. The magnification produced by plane mirror is +1. What does this mean?

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