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A concave mirror of focal length f in va...

A concave mirror of focal length `f` in vacuum is placed in a medium of refractive index 2. its focal length in the medium is

A

`(f)/(2)`

B

`f`

C

`2f`

D

`4f`

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The correct Answer is:
B
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CP SINGH-REFLECTION OF LIGHT-EXERCISES
  1. Check the wrong statement (s), if object is real (i) A concave mirro...

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  2. A convex mirror is used to form an image of a real object. The image ...

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  3. A concave mirror of focal length f in vacuum is placed in a medium of ...

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  4. A concave mirror of focal length f produces a real image n times the s...

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  5. An object 1cm tall is placed 4cm in front of a mirrorr. In order to pr...

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  6. A spherical mirror forms an erect image three times the size of the ob...

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  7. A concave mirror forms the image of an object on a screen. If the lowe...

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  8. An object is placed at 20 cm from a convex mirror of focal length 20 c...

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  9. An obejct is placed at a distance 2f from the pole of a convex mirror ...

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  10. An object is placed in from of a convex mirror of focal length 50 cm, ...

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  11. A concave mirror has focal length 15 cm. Where should an object be pla...

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  12. The image of an object placed on the principal axis of a concave mirro...

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  13. In a concave mirror, an object is placed at a distance d1 from the foc...

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  14. A square wire of side 3.0 cm is placed 25 cm away from a concave mirro...

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  15. For a concave mirror the magnificant of a real image was found to be t...

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  16. A concave mirror forms a real image three times larger than the object...

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  17. The sun subtends an angle half a degree at the pole of a concave mirro...

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  18. A thin rod of length (f/3) is lying along the principal axis of a conc...

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  19. A short linear object of length b lies along the axis of a concave mir...

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  20. A piece of wire bent into an L shape with upright and horizontal porti...

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