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A concave mirror has a focal length of 2...

A concave mirror has a focal length of 25 cm. At which of the following distace should a person hold his fce from this concave mirror so that it may act as a shaving mirror ?
(a) 45 cm
(b) 20 cm
25 cm
(c ) 25 cm
(d) 30 cm
Give reason for your choice.

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The correct Answer is:
20 cm
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LAKHMIR SINGH & MANJIT KAUR-REFLECTION OF LIGHT -Exercise
  1. An object is 100 mm in front of a concave mirror which produces an upr...

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  2. A virtual, erect and magnified image of an object is to be produced wi...

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  3. A concave mirror has a focal length of 25 cm. At which of the followin...

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  4. An object is placed at the following distances from a concave mirror o...

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  5. According to the "New Cartesian Sign Convention" for mirros, when sigh...

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  6. Which type of mirror has : (a) positive focal length ? (ii) negat...

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  7. What is the nature of a mirror having a focal length of, +10 cm ?

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  8. What kind of mirror can have a focal length of, -20 cm ?

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  9. In case of spherical mirrors, all distances are measured from………. .

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  10. What sign (+ve or -ve) has been given to the following on the basis of...

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  11. Sign Convention

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  12. Giving reasons, the 'signs' (positive or negative) which can be given ...

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  13. Sign Convention

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  14. One of the following does not apply to a concave mirror. This is :

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  15. If a magnification of, -1 (minus one) is to be obtained by using a con...

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  16. In order to obtain a magnification of, -0.6 (minus 0.6 ) with a concav...

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  17. An object is placed at a large distance in front of a concave mirror o...

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  18. Magnification produced by a rear view mirror fitted in vehicles

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  19. Between which two points of concave should an object be placed to obta...

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  20. At what distance from a concave mirror of focal length 10 cm should an...

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