in a light experiment with a convex lens a student plotted a graph as shown above of the reciprocal of object distance (1)/u against the reciprocal of image distance (1)/v . the focal length of the lens is given as
A
slope of line PQ
B
Reciprocal of either OP or OQ
C
Length OP or OQ
D
area under the graph E ratio OP/OQ
E
100Hz
Verified Correct Answer: B.
Physical Principles & Numerical Solution
The intercept on either of the axes of the graph of \(\frac{1}{u}\) against \(\frac{1}{v}\) gives the value of \(\frac{1}{f}\). Hence, the reciprocal of this intercecpt gives the value of the focal length.
Source: Official Exam / Past Question Archive