Physics, asked by shivam731, 1 year ago

the image formed by a spherical mirror is real ,inverted and is of magnification -2.if the image is at a distance of 30cm from the mirror , where is the object placed? find the focal length of the mirror

Answers

Answered by vinayak19
3
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Answered by santy2
11
Magnification = image distance ÷ object distance.

M = - 2

Image distance = 30cm

Since magnification is negative, the image distance is negative since the object distance is always positive.

-2 = - 30/v

v = - 30/-2 = 15cm

The object is placed at 15cm.

Mirror formulae :

1/f = 1/u + 1/v .

Where F is the focal length, u is the image distance and V the object distance.

1/f = - 1/30 + 1/15

1/f = 1/15 - 1/30 = (2-1)/30 =1/30

1/f = 1/30

Getting the reciprocal :

f = 30cm.
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