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(B) The lens is composed of three distinct horizontal sections,each made of a different material with a unique refractive index $(n_1, n_2, n_3)$.Sinc

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$3$

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(B) The lens is composed of three distinct horizontal sections,each made of a different material with a unique refractive index $(n_1, n_2, n_3)$.Since the focal length of a lens is given by the lens maker's formula,$1/f = (n - 1)(1/R_1 - 1/R_2)$,each section will have a different focal length because the refractive index $n$ is different for each part.When a point object is placed on the principal axis,light rays passing through each of the three sections will be refracted differently.Consequently,each section acts as an independent lens,forming its own image at a different position along the axis.Therefore,a total of $3$ distinct images will be formed.

$A$ convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis,the number of images formed are

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