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Which one of the following materials can...

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

A

clay

B

glass

C

water

D

plastic

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MBD -HARYANA BOARD-LIGHT:REFLECTION AND REFRACTION-EXAMPLE
  1. Define one dioptre.

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

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

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

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  5. The power of a lens is +2.0D. Its focal length should be:

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  6. Nature of image of a real object formed by convex mirror is always

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  7. The mirrors used as rear-view mirrors in vehicles are

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

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

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  10. The relation between the radius of curvature ® and focal length (f) of...

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  11. The unit of power of a lens is

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

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  13. Shaving mirrors are

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  14. Twinkling of stars is due to atmospheric

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  15. The defect of vision which cannot be corrected by using spectacles is ...

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

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

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

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

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  20. The value of refractive index of diamond is

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