Grade 12Mechanics
can the focal length of thin convex lens be equal to its radius of curvetur?
1 Answer
Siva Rama Krishna Gudipudi
yes it is possible
as you know the lens makers formula 1/f=[
2/1-1][1/r1-1/r2]
from this formula you may get the condition that focal length and radius of curvature are equal
and those conditions are
take 2=1.5 (which is the refractive index if a glass)
and 1=1 (which is the refractive index of air)
then take the concave lens of equal radius of curvatures.
Thus you will get a lens of equal radius of curvature and focal length.
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