Two plane mirrors are inclined at an angle 70 degrees .a ray incident on one mirror at an angle teeta after reflection falls on 2nd mirror and after reflected from there it moves parallel to the 1st then teeta is
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ANGLE OF REFLECTION=X=REFLECTION ANGLE
LOOK AT THE ANGLES IN THE TRIANGLES FORMED BY THE REFLECTED RAY AND THE TWO MIRROR.
ANGLE OF REFLECTION ON THE 2ND MIRROR =90-[180-70-(90-X)]
=70-X
ANGLE BETWEEN THE REFLECTED RAY AND THE 2ND MIRROR=X+20
x=50
AS IT IS PARALLEL TO THE 1ST MIRROR= X+20=70
LOOK AT THE ANGLES IN THE TRIANGLES FORMED BY THE REFLECTED RAY AND THE TWO MIRROR.
ANGLE OF REFLECTION ON THE 2ND MIRROR =90-[180-70-(90-X)]
=70-X
ANGLE BETWEEN THE REFLECTED RAY AND THE 2ND MIRROR=X+20
x=50
AS IT IS PARALLEL TO THE 1ST MIRROR= X+20=70
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