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By what angle should M2 be rotated

Q10.jpg By what angle shoulcl M. be rotated, so that the light ray after reflection froin both the mirror become horizontal? (as shown in figure)
Answers (1)
S safeer

To become horizontal angle of reflection from first mirror is 50 degree

now the ray should make same angle with M2 if its horizontal. But M2 is tilted by 25 degree. So with respect to M2 normal i=50+25=75 degree.

Now if the ray is horizontal then the angle between the emerging ray and mirror M2 is 90-25=65

so mirror has to be rotated (75-65)/2 = 5 degree counterclock wise to make emerging ray horizontal