A convex lens of focal length ' 
' is placed somewhere in between an object and a screen. The distance between the object and the screen is ' 
'. If the numerical value of the magnification produced by the lens is ' 
' then the focal length of the lens is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
: Let the object is placed at a distance 
from the convex lens.
Also, magnification, 
Image is real, magnification is negative.
Again, 
Put in (i), 
On solving, 
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