# NEET Physics Ray Optics and Optical Instruments Questions Solved

NEET - 2012

A ray of light is incident at an angle of incidence, i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face.If the refractive index of the prism is $\mu ,$ the angle of incidence i, is nearly equal to

(a)$\mu A$                                    (b)$\frac{\mu A}{2}$

(c)$A/\mu$                                  (d)$A/2\mu$

${r}_{1}+{r}_{2}=A\phantom{\rule{0ex}{0ex}}{r}_{2}=0⇒{r}_{1}=A$

Refractive index:

$\mu =\frac{\mathrm{sin}{i}_{1}}{\mathrm{sin}{r}_{1}}$

In case of small angle.

$\mu =\frac{i}{A}$

$i=\mu A$

Difficulty Level:

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