A thin biconvex lens is ground from glass of index

PHYSICS · Multi-part · Fermi University Physics · Optics & Photonics · Geometrical optics and imaging · Geometrical optics and imaging

Optics and Photonics, Ch Image formation by mirrors and lenses

Problem

n_l = 1.60

, with

R_1 = +15\,\mathrm{cm}

and

R_2 = -15\,\mathrm{cm}

under CV1 (light travels left to right;

R>0

when the centre of curvature lies to the right of the vertex). ((a)) Find the focal length of the lens in air (

n_m = 1.00

). ((b)) The lens is now immersed in a tank of cooking oil of index

n_m = 1.50

. Find its new focal length.