Two plane mirrors M1 and M2 are inclined to each other at an angle of 60 degrees as shown in figure. If a ray is incident at an angle of y degrees with normal on mirror M1 then what will be the value of x in degrees?

100

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160

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120

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240

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Solution

The correct option is C 120
we know that when two mirrors are inclined at an angle x then net deviation suffered is 360-2x. Applying the same concept here net deviation suffered is 360-2(60)= 240 degrees so remaining angle is: 360-240= 120 degrees.

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Q. In the given figure two plane mirrors M1 and M2 are inclined at an angle of θ with each other. If the reflected ray suffers a net deviation of 200 degrees then what will be the value of (θ+X) in degrees ?

The plane mirrors $M_{1}$ and $M_{2}$ are inclined to each other such that a ray of light incident on mirror $M_{1}$ and parallel to the mirror $M_{2}$ is reflected from mirror $M_{2}$ parallel to the mirror $M_{1}$ . The angle between the two mirror is (in degrees)