Question:
Two plane mirrors A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle $30^\circ$ at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is
Two plane mirrors A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle $30^\circ$ at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is
Updated On: Jun 7, 2024
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The Correct Option is B
Solution and Explanation
$d=0.2 tan 30^\circ=\frac{0.2}{\sqrt{3}}$
Therefore, maximum number of reflections are 30.
NOTE Answer of this question may be 30 or 31.
Therefore, maximum number of reflections are 30.
NOTE Answer of this question may be 30 or 31.
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Concepts Used:
Reflection of Light
When a light ray falls on any object, it is bounced back from the object. This process is known as the Reflection of light. The light reflected from the object falls into our eyes, making the object visible to us. All the things we see around us are because of reflection.
The reflection of light depends on the type of object. A polished or smooth surface reflects most of the light falling on it, while a rough surface absorbs some amount of light and reflects back the rest of the light. The direction of reflected rays depends upon the surface of the object.