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

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

A

20 cm

B

`-20 cm`

C

`-0.2 m`

D

5 cm

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MBD-LIGHT:REFLECTION AND REFRACTION-EXAMPLE
  1. Parallel rays incident on a mirror,after reflection converge at a poin...

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  2. The unit of power of lens is…… .

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

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

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  5. Shaving mirrors are-

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  6. Which of the following is the property of light?

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  7. Twinkling of stars is due to atmospheric:

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  8. Defect of vision that cannot be corrected by spectacles is:

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

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  10. Where should object be placed in front of a convex lens to get real im...

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

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  12. No matter how far you stand from a mirror,your image appear erect.The ...

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  13. The refractive index of diamond is:

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  14. A ray of light travelling in a glass merges into air, it will bend:

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  15. A concave mirror forms image inverted and equal in size, when object i...

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  16. A…………. Mirror is used to see the rear view in cars.

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  17. The ratio of sine of angle of incidence to the sine of angle of refrac...

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  18. When a beam of light passes form optically rarer medium to optically d...

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  19. …is the unit of power of the lens

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  20. A virtual and enlarged image is formed by a …….mirror.

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