Geometrical OpticsHard
Question
In the displacement method for determining the focal length of a convex lens, the lens is displaced by distance x to again obtain a sharp image on the screen. If the magnification in two positions are m1 and m2 respectively, the focal length of the lens is
Options
A.
B.
C.
D.
Solution
For convex lens
.......(i)
m1 - m2 =
.......(ii)
x = v - u .......(iii)
Using (i) & (ii) & (iii)
f =
.......(i)m1 - m2 =
.......(ii)x = v - u .......(iii)
Using (i) & (ii) & (iii)
f =
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