Question
A uniform rope having some mass hanges vertically from a rigid support. A transverse wave pulse is produced at the lower end. The speed $(v)$ of the wave pulse varies with height $(h)$ from the lower end as:
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($A$) The refractive index of the lens is $2.5$
($B$) The radius of curvature of the convex surface is $45 \mathrm{~cm}$
($C$) The faint image is erect and real
($D$) The focal length of the lens is $20 \mathrm{~cm}$