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Q.

Two identical thin plano convex lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces towards each other. The space  between lenses is filled with liquid of refractive index 1.7. Focal length of combination is

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a

-25cm

b

50cm

c

20cm

d

-50cm

answer is C.

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Detailed Solution

1f1=1f3=μg−11R=0.520=140 1f2=μl−1−2R=(0.7)−220=−2.840 1F=1f1+1f2+1f3=−150∴F=−50 

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