Question

Which lens will have a greater focal length?
Two different materials, glass and diamond are used to make convex
lenses of the same thickness . So which lens will have a greater focal length?

Answer 1

1/ f =( d -1){ 1/R 1 - 1/R2}
you can see f is inversely proportional to ( d -1). e.g d

we know ,
refractive index of diamonds is greater then refractive index of glass.

so,
focal length of glass is greater then diamonds

Answer 2

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