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What is meant by power of a lens? Define...

What is meant by power of a lens? Define its SI unit.

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The power of a lens is defined as the reciprocal of its focal length (f) expressed in metres. SI unit of power is dioptre.
One dioptre is defined as the power of a lens whose focal length is 1 metre.
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OSWAAL PUBLICATION-LIGHT-REFLECTION AND REFRACTION-TOPIC -2 REFRACTION, LENSES, POWER OF LENS (SHORT ANSWER TYPE QUESTIONS I)
  1. What is meant by power of a lens? What does its sign (+ve or -ve) indi...

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  2. What is meant by power of a lens? Define its SI unit.

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  3. State two laws of refraction.

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  4. State four characteristics of the image formed by plane mirror.

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  5. Mention the kind of lens that can form: (i) Real, inverted and magni...

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  6. Brielf describe an activity to find approximate focal length of a conv...

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  7. What is meant by the power of a lens? Give its SI unit. When two or mo...

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  8. The refractive indices of glass and water with respect to air are 3/2 ...

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  9. The absolute refractive indices of glass and water are 4/3 and 3/2 res...

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  10. A ray of light incident on a rectangular glass slab immersed in any me...

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  11. A ray of light falls normally on the surface of a transparent glass sl...

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  12. Light enters from air into glass plate which has refractive indeed 1.5...

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  13. Draw the ray diagram for the formation of image by a concave lens when...

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  14. For the same of incidence in media P,Q and R, the angle of refractive ...

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  15. The refractive index of a dense flint glass is 1.65 and for alcohol it...

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  16. Define absolute refractive index of a medium. Light enters from air to...

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  17. A convex lens of focal length 10 cm is palced at a distance of 12 cm f...

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