Question

which lens has greater focal length from thick lens or thin lens

Answer 1

Physically, the phenomenon of refraction at a curved surface is described by the Fermat's principle. For a thick lens, the optical path length of the light is more, than for a thin lens, thus, the bending of light will be more in case of a thicker lens. Consequently, it has a shorter focal length.

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Answer 2

hey thin lens has greater focal length as compared to thin lens.

For a thick lens, the optical path length of the light is more, than for a thin lens, thus, the bending of light will be more in case of a thicker lens. Consequently, it has a shorter focal length.