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Define focal length of a lens...

Define focal length of a lens

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MBD-LIGHT:REFLECTION AND REFRACTION-EXAMPLE
  1. Define power of a lens

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  2. Define a dioptre

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  3. Define focal length of a lens

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  4. What is the nature of the mirror having focal length - 15 cm?

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  5. A mirror has magnification 0.4, What type of the mirror is and what ty...

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  6. What is curvature of a mirror? What is its value for plane mirror?

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  7. A ray strikes the mirror normally, what is the angle of incidence?

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  8. The power of a lens is 2 dioptre its focal length will be…. .

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  9. ………..froms virtual and same size of image of an object

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  10. The image of an object formed by a convex mirror is always…..

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  11. ….is used in motor vehicles to take rear view.

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  12. sin i / sin r relation was given by …………

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  13. The focal length of a lens is expressed by which of the following:

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  14. The relation between the radius of curvature (R) and focal length (f) ...

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  15. Where will the real and inverted image of an object placed at the cent...

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  16. The mirror used for getting real and enlarged image is…… .

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  17. Parallel rays incident on a mirror,after reflection converge at a poin...

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  18. The unit of power of lens is…… .

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  19. Power of a lens is -5d, its focal length is:

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

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