A symmetric biconvex lens of radius of curvature R and made of glass of refractive index 1.5, is placed on a layer of liquid placed on top of a plane mirror as shown in the figure. An optical needle with its tip on the principal axis of the lens is moved along the axis until its real, inverted image coincides with the needle itself. The distance of the needle from the lens is measured to be x. On removing the liquid layer and repeating the experiment, the distance is found to be y. Obtain the expression for the refractive index of the liquid in terms of x and y.
A symmetric biconvex lens of radius of curvature R and made of glass of refractive index 1.5, is placed on a layer of liquid placed on top of a plane mirror as shown in the figure. An optical needle with its tip on the principal axis of the lens is moved along the axis until its real, inverted image coincides with the needle itself. The distance of the needle from the lens is measured to be x. On removing the liquid layer and repeating the experiment, the distance is found to be y. Obtain the expression for the refractive index of the liquid in terms of x and y.
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Transcribed Image Text:A symmetric biconvex lens of radius of curvature R
and made of glass of refractive index 1.5, is placed
on a layer of liquid placed on top of a plane mirror
as shown in the figure. An optical needle with its
tip on the principal axis of the lens is moved along
the axis until its real, inverted image coincides
with the needle itself. The distance of the needle
from the lens is measured to be x. On removing
the liquid layer and repeating the experiment, the
distance is found to be y. Obtain the expression
for the refractive index of the liquid in terms of x
and y.
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