Question

when the Mirrors are kept at right angles to each other the incident ray and the reflected ray are parallel to each other explain it​

Answer 1

Answer:

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Answer 2

Explanation:

Two mirrors M1 and M2 are inclined at right angles. A ray strikes M1 at point C, making any angle y with mirror, and angle of incidence X with normal. Then, it strikes another mirror M2 at A, and reflects away. We extended both normals to meet at point B.

Off course, angle between normals N1 and N2 is 90. (degrees).

Now see, normal N2 and mirror plane M1 are parallel. Or, AB||OC.

Then, then angle CAB= angle Y. (pair of alternate interior angles).

Then, as angle of incidence=angle of reflection, the angle between reflected ray and it's normal (AB) is equal to angle Y.

As both incident ray and reflected rays are making similar angle Y with horizontal plane (remember (AB||OC)),