When an object is kept at a distance of 30 cm from a concave mirror, the image is formed at a distance of 10cm. If the object is moved with a speed of 9 
the speed with which image moves is:
(a 
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
: According to mirror formula,
Differentiating with respect to t, we get
or 
Substituting thegiven values, we get
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