Question

For a small angled prism, angle of prism $A$, the angle of minimum deviation ( $\delta$ ) varies with the refractive index of the prism as shown in the graph

• A. Point P corresponds to m = 1
• B. Slope of the line PQ = A/2
• C. Slope = 2A
• D. None of the above statements is true

Answer 1

Answer: (A)

At $P, \delta=0=A(\mu-1) \Rightarrow \mu=1$
Also $\delta_{m}=(\mu-1) A=A \mu_{m}-A$
Comparing it with $y=m x+c$
Slope of the line $=m=A$