CBSE Class 12-science Answered
Q.56 The figure shows a convergent lens placed inside a cell filled with a liquid. The lens has a focal length +20 cm, when in air and its material has refractive index 1.5. if the liquid has a refractive index 1.6, the focal length of the system is
a) +80 cm
b) –80 cm
c) –24 cm
d) –160 cm
Asked by Malavika Umesh | 05 May, 2015, 06:16: PM
Expert Answer
Given:
Focal length of lens= +20 cm
Refractive index in air = 1.5
Refractive index of liquid = 1.6
Focal length, F=?
By using,
Answered by Faiza Lambe | 05 May, 2015, 08:31: PM
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