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Grade: 12
        
a concave mirror gives a real image magnified 4 times .when the objects id moved 3 cm the magnification of the real image is 3 times .find the focal length of mirror?
one month ago

Answers : (1)

Vikas TU
10083 Points
							
Dear student 
Magnification = -v/u 
-v/u = -3 
v = 3u
1/f = 1/v + 1/u 
1/(-3) = (3+1)/3u 
3u/4 = -3 
3u = -12 
u = -4 
v = 3u = -12 cm 
 
one month ago
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