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A concave mirror of focal length f (in a...

A concave mirror of focal length `f` (in air) is immersed in water `(mu=4//3)`. The focal length of the mirror in water will be

A

f

B

`(4)/(3)f`

C

`(3)/(4) f`

D

`(7)/(3) f`

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Verified by Experts

The correct Answer is:
A
On immersing a mirror in water, focal length of the mirror remains unchanged as medium does not affect the focal length of a mirror.
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-RAY OPTICS-EXERCISE 1 (TOPICAL PROBLEMS)
  1. A concave mirror of focal length f (in air) is immersed in water (mu=4...

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  2. An object is placed 40 cm from a concave mirror of focal length 20 cm....

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  3. A point object is placed at a distance of 30 cm from a convex mirror o...

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  4. An object is placed at a distance of 30 cm from a concave mirror and i...

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  5. A convex mirror of focal length f produced an image (1//n)^(th) of the...

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  6. The focal length of a concave mirror is 50cm. Where an object be place...

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  7. An object of size 7.5 cm is placed in front of a convex mirror of radi...

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  8. The image formed by a convex mirror of focal length 30 cm. is a quarte...

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  9. A concave mirror gives an image three times as large as the object pla...

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  10. A point object is placed at a distance of 10 cm and its real image is ...

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  11. Object is placed 15 cm from a concave mirror of focal length 10 cm, th...

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  12. Where should a person stand straight from the pole of a convex mirror ...

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  13. Find the position of image from given diagram.

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  14. A plano convex lens is made of glass of refractive index 1.5. The radi...

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  15. At what distance from a convex lens of focal length 30cm an object sh...

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  16. A plano - convex lens is made of flint glass. Its focal length is

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  17. Distance of an object from a concave lens of focal length 20 cm is 40 ...

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  18. Where should an object be placed from a converging lens of focal lengt...

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  19. An object is placed at 10 cm from a lens and real image is formed with...

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  20. The real image which is exactly equal to the size of an object is to b...

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