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The radius of curvature of a spherical mirror is 20 cm. What is the focal length ?

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Define focal length of a concave mirror. Prove that the radius of curvature of a concave mirror is double its focal length.

VGS PUBLICATION-BRILLIANT-REFLECTION OF LIGHT AT CURVED SURFACES-EXERCISE
  1. What is a virtual image ?

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  2. What is meant by converging of light rays?

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  3. When do you say light rays are diverging?

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  4. If focal length is 20 cm then what is radius of curvature of mirror ?

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  5. When does a ray reflect along the same path from a concave mirror?

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  6. Where do you place the vessel in solar cooker?

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  7. If the magnification is always less than 1 then what is the mirror?

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  8. The radius of curvature of a spherical mirror is 20 cm. What is the fo...

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  9. Name mirror that can give an erect and enlarged image of an object.

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  10. The focal length of convex mirror is 16 cm. What is its radius of curv...

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  11. A concave mirror produces three times magnified real image of an objec...

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  12. Which objects at your home act as spherical mirrors?

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

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  14. Can a convex mirror burn a paper? If not? Why?

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  15. The mirror which has a wide field of view must be

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  16. Why does our image appear thin or bulged out insome mirrors ?

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  17. Can we focus sunlight at a point using a mirror instead of magnifying ...

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  18. What is a spherical mirror? Give different types of spherical mirrors.

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  19. Assume that an object is kept at a distance of 20 cm in front of a con...

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  20. Assume that an object is kept at a distance of 20 cm in front of a con...

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