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CBSE Class 10 Answered

A dentist uses a small concave mirror of focal length 16mm to view a cavity in the tooth of a patient  by holding the mirror at a distance of 8mm from the cavity. Calculate the magnification
Asked by rushabhjain.avv | 19 Mar, 2019, 08:02: PM
answered-by-expert Expert Answer

okay, so here since its the object (8mm) is placed between the focus (16mm) and pole, the image obtained will be virtual and erect.

so the focal length is taken to be positive as the image obtained is towards the right of the mirror and object distance as negative.

using mirror formula,

1/f =1/v + 1/u

we get v as 16mm

now magnification for mirror, m = -v/u

= -16/-8

=2

magnification is 2, image is twice the size as object

Answered by Shiwani Sawant | 21 Mar, 2019, 07:37: AM
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