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Grade: 11
        
Please guide me in this question?
10 months ago

Answers : (1)

Arun
14827 Points
							
Dear Sneha
 

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)

10 months ago
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