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Two plano-concave lenses (1 and 2) of gl...


Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 have radii of curvature 25 cm and 20 cm. They are placed in contact with their curved surface towards each other and the space betweent hem is filled with liquid of refractive index `(4)/(3)` the the combination is

A

convex lens of focal length 70 cm

B

concave lens of focal length 70 cm

C

concave lens of focal length 66.6 cm

D

convex lens of focal length 66.6 cm

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The correct Answer is:
C
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