10.A ray of light that strikes a plane mirror XY at an angle of incidence of 60degree, is reflected from the plane mirror and then strikes a second plane mirror YZ placed at right angles to the first mirror. The angle of reflection at the second mirror is:
90degree
60degree
45degree
30degree
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A ray of light strikes a plane mirror XY at an angle of incidence of 65 degree is reflected from this plain mirror and then strikes a second plane mirror YZ placed at right angle to the first mirror. From ∆MYN, angle MNY = 65°. So reflected angle = 25° for mirror YZ.
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