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

Options

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

A

Explanation

At `P,delta=0=A(mu-1)impliesmu=1`
Also `delta_(m)=(mu-1)A=Amu_(m)-A`
Comparing it with `y=mx+c`
Slope of the line `=m=A`
It mean that medium 2 is denser medium. So total internal reflection cannot occur.