Determine the focal length of a concave lens with the help of a convex lens.
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The focal length can be obtained by using the following formula.
f = uv / u − v
Explanation:
Form lens formula we have:
f = uv / u − 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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