Two plane mirrors are placed perpendicular to each other. A ray strikes one mirror and after reflection falls on the second mirror. The ray after reflection from the second mirror will be

Two plane mirrors are perpendicular to each other. A ray after suffering reflection from the two mirror will be

Two plane mirrors are inclined at an angle theta to one another. A ray of light incident on the first mirror and parallel to the second mirror is reflected from the second mirror parallel to the first mirror. What is the value of theta ?

Two plane mirrors are inclined at 70^@ . A ray incident on one mirror at angle theta after reflection falls on second mirror and is reflected from there parallel to first mirror. The vaule of theta is