If an object is kept at a distance of 20 cm. in front of a convex mirror . The focal length of the mirror is 10 cm. Find the distance of the image from the mirror.
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Object distance U = -5 cm(to the left of mirror)
Image distance V = ?
Focal length f = 10 cm(convex mirror)
By using the mirror formula we have
1/V + 1 / U = 1/f
1/V + 1/-5 = 1/10
1 / V = 1/10 + 1/5
1/V = 3/10 or V = 10/3
V = +3.33cm
Position of the image is at a distance of 3.33 cm from the convex mirror on its right side(behind the mirror). Since the image is formed behind the convex mirror, therefore the nature of image is virtual and erect.
Magnification m = - V/U
So m = - (3.33)/-5
m = +0.66
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