how can we check the focal length of a convex lens approximately but quickly.
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➡For convex lens the focal length is positive. On the other hand, the focal length of concave lens is negative. Thus, for convex lens, the focal length is a distance over which all the parallel rays will converge. A certain point over that distance all the parallel rays will converge, that point is known as focal point.
srbalaji282003:
Waste
this is right
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1/f=1/v-1/u
V is image distance &U is object distance
this is the formula of but I say in the question to find the focal length quickly
yr telling the formula
If you find in this way You will feel little quicker there is no quicker method than this way
the question is that how we find the focal length of convex lens without using paper then what can you do
I'll calculate in mind itself
but this answer is written in many books
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