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  4. The following figure shows the multiple reflections of a light ray along a glass corridor where the walls are either parallel or perpendicular to one another. If the angle of incidence at point P is 30° , then the angles of reflection of the light ray at points Q , R , S and T respectively are <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-0qzxm9qfwfozyxkt.jpg />

Q. The following figure shows the multiple reflections of a light ray along a glass corridor where the walls are either parallel or perpendicular to one another. If the angle of incidence at point is , then the angles of reflection of the light ray at points , , and respectively are
Question

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Solution:

According to the law of reflection on a plane mirror, the incident angle is equal to the reflection angle.
i.e.,
Using this rule and the properties of a right angle triangle, we obtain:
Solution
So, the angles of reflection of light at points are respectively.