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(D) cylindrical lens has curvature in only one direction (perpendicular to its axis). When a parallel beam of light is incident on a plano-cylindrical

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There will be a single bright line on the screen parallel to the $Y$-axis

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(D) cylindrical lens has curvature in only one direction (perpendicular to its axis). When a parallel beam of light is incident on a plano-cylindrical lens,the light rays are refracted only in the plane perpendicular to the cylinder's axis. These rays converge at the focal line of the lens. Since the lens is oriented such that its axis is parallel to the $Y$-axis,the convergence occurs along a line parallel to the $Y$-axis on the focal plane. Therefore,a single bright line parallel to the $Y$-axis will be observed on the screen.

Consider a plane parallel beam of light incident on a plano-cylindrical lens as shown below. Which of the following will you observe on a screen placed at the focal plane of the lens?

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