Two flat mirrors make an angle of 90.0° with each other, as diagrammed below. An incoming ray makes an angle of 35° with the normal of mirror A. Use the law of reflection to determine the angle of reflection from mirror B. What is unusual about the incoming and reflected rays of light for this arrangement of mirrors?
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The angle of reflection from mirror B is 55 degrees and the unusual thing about incoming and final reflected rays of light are parallel to each other.
What is reflection?
- When a incident ray returns back to the same medium from which it came from, then that it called the particle property of light - reflection.
- Bouncing back of light ray from a polished surface when a ray is incident on it is called reflection phenomena.
What is law of reflection for plane mirror?
Angle of incidence for any incident ray is equal; to the angle of reflection of the reflected ray.
What is angle of incidence?
The angle made by the incident ray with the normal drawn at the interface of interaction of the two medium is called angle of incidence.
What is angle of reflection?
The angle made by the reflected ray with the normal drawn at the interface of interaction of the two medium is called angle of reflection.
The illustration of the two mirror is given below:
- Mirror A and mirror B intersects at point O at 90 degrees.
- CD and XY are normal drawn at mirror A and mirror B respectively.
- MP is the incident ray for mirror A with angle of incidence equal to 35 degrees.
- QN is the reflected ray for mirror B with angle of reflection equal to 55 degrees.
- The incident ray MP and reflected ray QN are parallel to each other as the ∠MPQ and ∠NQP are supplementary angles which proves the property of parallel lines that is sum of inner angle is equal to 180.
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