Two plane mirrors are inclined at 70$^{\circ}$. A ray incident
on one mirror at angle, $\theta$ after reflection falls on
second mirror and is reflected from there parallel
to first mirror. The value of $\theta$ is
- 45$^{\circ}$
- 30$^{\circ}$
- 55$^{\circ}$
- 50$^{\circ}$
The Correct Option is D
Solution and Explanation
$\theta +40 ^ \circ = 90 ^ \circ $
$\therefore \, \, \, \theta = 90 ^ \circ - 40 ^ \circ =50 ^ \circ$
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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.