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Ncert class 12 9.38
Dear Swapan,
Focal length of the convex lens, f1 = 30 cm
The liquid acts as a mirror. Focal length of the liquid = f2
Focal length of the system (convex lens + liquid), f = 45 cm
For a pair of optical systems placed in contact, the equivalent focal length is given as:
Let the refractive index of the lens be and the radius of curvature of one surface be R. Hence, the radius of curvature of the other surface is −R.
R can be obtained using the relation:
Let be the refractive index of the liquid.
Radius of curvature of the liquid on the side of the plane mirror =
Radius of curvature of the liquid on the side of the lens, R = −30 cm
The value of can be calculated using the relation:
Hence, the refractive index of the liquid is 1.33.
Best Of luck
Plz Approve the answer...!!!!
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