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A Concave Mirror Has a Focal Length of 25 Cm. at Which of the Following Distance Should a Person Hold His Face from this Concave Mirror So that It May Act as a Shaving Mirror? (A) 45 Cm (B) 20 Cm (C) 25 Cm (D) 30 Cm Give Reason for Your Choice. - CBSE Class 10 - Science

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Question

A concave mirror has a focal length of 25 cm. At which of the following distance should a person hold his face from this concave mirror so that it may act as a shaving mirror?

(a) 45 cm
(b) 20 cm
(c) 25 cm
(d) 30 cm
Give reason for your choice.

Solution

A person must hold his face at a distance of 20 cm , away from the concave mirror. A concave mirror forms an erect, virtual and magnified image when an object is placed between the focus and the pole. Therefore, it acts as a shaving mirror.

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Solution A Concave Mirror Has a Focal Length of 25 Cm. at Which of the Following Distance Should a Person Hold His Face from this Concave Mirror So that It May Act as a Shaving Mirror? (A) 45 Cm (B) 20 Cm (C) 25 Cm (D) 30 Cm Give Reason for Your Choice. Concept: Reflection of Light - Image Formation by Spherical Mirrors - Concave Mirror.
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