detcermine the focal length of a concave lens using a convex lens
Answers
Answer:
Materials Required
An optical bench with four upright
A convex lens with a lens focal length
A concave lens with a more focal length
Two lens holders
One thick and one thin optical needle
A knitting needle
A half-metre scale
Theory
We use the lens formula in this experiment to calculate the focal length of the concave lens:
f=uvu−v
Where,
f is the focal length of the concave lens L1
u is the distance of I from the optical centre of the lens L2
v is the distance of I’ from the optical centre of the lens L2.
From sign convention, the f obtained from the above formula will be negative as v > u and u – v is negative.
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Explanation:
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