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Define one dioptre of power of a lens....

Define one dioptre of power of a lens.

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a) What do you understand by the power of a lens? Name one factor on which the power of a lens depends. b) What is the unit of power of a lens? Define the unit of power of a lens. c) A combination of lenses for a camera two converging lenses of focal length 20 cm and 40 cm and a diverging lens of focal length 50 cm. Find the power and focal length of the combination.

One dioptre is the power of a lens of facal length

What is the power of a lens ?

MBD -HARYANA BOARD-LIGHT: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 s...

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  3. Define one dioptre of power of a lens.

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  4. What is the unit of power of a lens ? Define it .

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  5. A convex lens forms a real and inverted image of a needle at a distanc...

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  6. Find the power of a concave lens of focal length 2 m.

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  7. Which one of the following materials cannot be used to make a lens ?

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

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

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

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  11. No matter how far you stand from a mirror, your image appears erect. T...

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

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

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  14. Name the type of mirror used in the following situations : (a) Head ...

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  15. Name the type of mirror used in the following situations : (a) Head ...

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  16. Name the type of mirror used in the following situations : (a) Head ...

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

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  18. 10 cm high object is placed at a distance of 25 cm from a converging l...

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  19. A convceve lens of focal length 15 cm forms an image 10 cm from the le...

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

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