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  4. Two plane mirrors are at an angle of 30° . Find the deviation produced in the ray after 3 successive reflections as shown in figure.

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Q. Two plane mirrors are at an angle of $30^{\circ} .$ Find the deviation produced in the ray after 3 successive reflections as shown in figure.Physics Question Image

Ray Optics and Optical Instruments

Solution:

image
$\delta_{1}=100^{\circ} CW$
$\delta_{2}=180-20=160 ACW$
$\delta_{3}=180-40 CW =140^{\circ}$
$\delta=100^{\circ}+140^{\circ}-160^{\circ}=80^{\circ}$