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Which lens will have a greater focal length?

Two different materials, glass and diamond are used to make convex
lenses of the same thickness we know that diamond can bend light more
than glass.which lens will have a greater focal length?



I think glass will hav more focal length
and also critical angle for diamond is very less so most of the rays remains inside it but i don't think that it has some effect on focal length
0 0 0
as center of curvature(C) is constant for any spherical mirror. and we also know that f = 1/2C. So isn't f also remains constant?
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