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A concave mirror has a magnification of -2.5 if its focal length is 20 cm find its image and object position?
Asked by ajajaysanja | 23 Oct, 2019, 11:00: AM
m =-2.5 cm
v =?
u= ?
f =-20 cm

The linear magnification of mirror is given as
m =-v/u

This means object distance is 28 cm and the negative sign indicates that the image is formed to the left side of the mirror.

Now, substituting the value of u in equation (1), we get,

v = 2.5 × (-28 cm)
Thus,
v = - 70 cm

Thus, image distance is 70 cm and the negative sign indicates that the image is also formed to the left side of the mirror.
Answered by Shiwani Sawant | 23 Oct, 2019, 12:19: PM

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