NEET Physics Ray Optics and Optical Instruments Questions Solved


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 refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is

                         

(a) + 80 cm                         (b) – 80 cm

(c) – 24 cm                          (d) –100 cm

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