Question

which lens thick or thin will have greater focal length

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 lengthof 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.

Answer 2

Hey buddy!☺️

Thick lens will have shorter and consequently thin lens will have greater focal length.

Because,

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.

Hope it helps❤️