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The distance of an object and its image ...

The distance of an object and its image from the focus of a concave mirror are 8 cm and 12 cm respectively. The focal length of the mirror is

A

8cm

B

12cm

C

10cm

D

between 8 and 12

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The correct Answer is:
C
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BINA LIBRARY-Optics-I-EXERCISE
  1. Give reasons why convex mirrors are generally used as driving mirrors.

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  2. The image of an object placed between the principal focus and the cent...

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  3. The distance of an object and its image from the focus of a concave mi...

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  4. An inverted image can be seen in a convex mirror

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  5. A concave mirror produces a virtual image when the object is

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  6. What is the speed of light in glass of refractive index 1.5 if the vel...

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  7. The refractive index of a medium is 1.8. A bubble lies in this medium ...

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  8. When light travels from glass to air, there is no change in its

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  9. The lateral shift produced in a parallel sided glass slab depends on

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  10. What is optical fibres? What principle is used in it?

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  11. The refractive index of an equilateral prism is 'sq.root 3' . What is ...

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  12. The minimum distance between an object and its real image is

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  13. Critical angle of light passing from glass to air is minimum for

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  14. The critical angle for a medium is 60°. Then the refractive index of t...

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  15. In which of the following cases total internal reflection can not be o...

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  16. The distance between the object and its real image formed by a convex ...

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  17. The focal length of a lens depends upon

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  18. A contact combination is made of a thin convex lens (f = 9 cm) and a t...

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  19. Two thin lenses of focal length 20 cm and 25 cm are placed in contact....

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  20. A lens behaves as a converging lens in air and a diverging lens in wat...

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