Question

Proper Experiment to determine the focal length of a concave lens by obtaining the image of distant object.
(Hint- Aim, Material required, theory, procedure, observation, conclusion.)​

Answer 1

Answer:

Explanation:

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.