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Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length +20 cm when in air and its material has a refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is |
| Answer» TION:f = R / 2(N -1)for convex lensf = R / 2(1.5 -1)f=Rfor plano concavef' = R / (n -1)f' = R / (1.6 -1)f' = f/ 0.6Net f1/f^ = 1/f - 2/f'1/f^ = - 0.2/f = -0.2/ 20F^ = -100cm | |