Physics, asked by mdghaziabbas786, 4 months ago

can we find the focal length of convex lens by spherometer​

Answers

Answered by upendra44506
0

Answer:

Intuitively, the radius of curvature has to depend on the index of refraction of the glass. If the index were 1, the lens would have no effect at all. If the index were very high, say 10, it would not take much curvature to get a given f'ocal length. Clearly we cannot just say the radius of curvature is twice the focal length.

You have applied the lens maker's formula correctly to your problem. There is no problem with R=f, in fact that is always true for μ2=1.5μ1. We are assuming a thin lens in this formula, so the diameter of the lens must be small compared with R. If the focal length is 30 cm and the diameter of the lens is 1 cm the thickness is twice the height of a circular segment. Given R=30,c=1 we have h=R−R2−(c4)2−−−−−−−−√=30−900−14−−−−−−−√≈0.004 so the lens is about 1 mm thick

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