A spherical mirror forms a real image three times the linear size of the object. If the distance between the object and the image is 80 cm, the focal length of the mirror is
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a
15 cm
b
−15cm
c
−30cm
d
40 cm
answer is C.
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Detailed Solution
Magnified real image is formed by concave mirror. Here V = 3u (in same side)|v−u|=|2u|=80⇒u=−40cm1f=1v+1u=13(−40)+1−40=1+3−120=−130f = -30 cm