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  4. A ray of light strikes a plane mirror M at an angle of 45° as shown in the figure. After reflection, the ray passes through a prism of refractive index 1.5 whose apex angle is 4°. The total angle through which the ray is deviated is

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Q. A ray of light strikes a plane mirror $M$ at an angle of $45^{\circ}$ as shown in the figure. After reflection, the ray passes through a prism of refractive index $1.5$ whose apex angle is $4^{\circ}$. The total angle through which the ray is deviated isPhysics Question Image

Ray Optics and Optical Instruments

Solution:

As, $\delta_{\text {net }}=\delta_{\text {mirror }}+\delta_{\text {prism }}$
$=(180-2 i)+(\mu-1) A=(180-2 \times 45)+(1.5-1) \times 4=92^{\circ}$