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OTP to be sent to Change
u = -25 cm
f = - 10 cm
Using mirror formula,
1/f = 1/u + 1/v
-1/10 = -1/25 + 1/v
v = - 50/3
Magnification m,
m = - v/u = - [(-50/3)/(-25)] = -2/3
m = I/O = - 2/3
Length and breath both change in the same proportion.
Area of the object AO = 3 x 3 = 9 cm2
AI/AO = (-2/3)2
AI = (4/9) x 9 = 4 cm2
Regards
Arun (askIITians forum expert)
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