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a ray of light making an angle 10 degree with the horizontal is incident on aplane mirror making an angle theta with the horizontal ,what should be the value of theta so that the reflected ray goes vertically upwards?

The answer is 40 degrees.

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The mirror is inclined with an angle theta with respect to the surface and the incident ray makes an angle of 10 degree with the horizontal surface the given angle theta that can be found by the method given in the picture

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Let suppose that plane mirror is inclined at an angle theta and incident ray at an angle of 10 degree with the horizontal

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