1.

Two plane mirrors are inclined at 70 degree. A ray incident on one mirror at incident angle theta,after reflection falls on the 2nd mirror and is reflected from there parallel to the first mirror. The value of theta is

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Two plane mirrors are inclined at 70 degree. A ray incident on one mirror at incident angle theta,after reflection falls on the 2nd mirror and is reflected from there parallel to the first mirror. The value of theta is



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