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Object placed in front of a concave mirror At distance x cm from pole gives 3times magnification if it is moved at distance x+5 cm magnification of image becomes 2 focal length of mirror is

Object placed in front of a concave mirror  At distance x cm from pole gives 3times magnification if it is moved at distance x+5 cm magnification of image becomes 2 focal length of mirror is

Grade:12th pass

1 Answers

Arun
25763 Points
2 years ago
Dear student
 
m1 = -f + u/-f = 3
 
2 f = 3u
 
also
m2 = -f / -f + (u+5)  = 2
 
now solve both equation,
 
f = – 30 cm
 
hope it helps

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