Question

Figures shows the graph of angle of deviation $\delta$ versus refractive index $\mu$ of the material of constant thin angled prisms corresponding to light raysincident at a small angle of incidence. The slope of the line is

Answer 1

Angle of deviation for a thin prism is given as $\delta =(\mu -1)A$

$⟹$ slope of $\delta$ vs $\mu$ curve is $A$.

Since the deviation for $\mu =1$ is zero, the point at which the graph cuts x-axis is 1.

Thus the slope of the graph $=A=4$