Questions
The same size images are formed by a convex lens when the object is placed at 20cm or at 10cm from the lens. The focal length of convex lens is……………
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15
1/v – 1/u = 1/f …(1)
m = v/u ….(2)
from (1) and (2) we get ,
m = f/(f + u) ;
Given conditions
m1 = -m2 ;
f/(f – 10) = -f/(f – 20) ;
f – 20 = –f + 10 ;
2f = 30 ;
f = 15 cm
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