If a thin lens is made then its focal length as compared to a thick lens is ----
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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.
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assuming lence are made of this some material,thicker one will be ableto behinde the light more as the light travels though it for a long period of time.As we know greater the bending lesser the focal length so thin one will have more focal length
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