A liquid of refractive index 1.6 is contained in the cavity of a glass specimen of refractive index 1.5 as shown in Fig. If each of the curved surfaces has a radius of curvature of 0.20m, the arrangement behaves as a
Converging lens of focal length 0.25m
Diverging lens of focal length 0.25m
Diverging lens of focal length 0.17m
Converging lens of focal length 0.72m
A
Diverging lens of focal length 0.17m
B
Converging lens of focal length 0.72m
C
Converging lens of focal length 0.25m
D
Diverging lens of focal length 0.25m
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Solution
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Power of liquid lens =(1.6−1)(20.20)=610×10=6D Power of concave lens =−(1.5−1)=−0.5×10D Total power of two concave lenses =−10D Power of system =−10D+6D=−4D Force length =1−4=0.25m.
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