A ray of light is travelling at an angle of 20° above the horizontal. At what angle with the horizontal must a plane mirror be placed in its path so that it becomes vertically upward after reflection.

A light ray is incident on a plane mirror at an angle of 30^(@) with horizontal. At what angle with horizontal must a plane mirror be placed in its path so that it becomes vertically upwards after reflection?

A light ray is incident on a planemirror at an angle of 30^(@) with horizontal. At what angle with horizontal must a plane mirror be placed in its path so that it bacomes vertically upwards after reflection?

On a plane mirror, a ray of light is incident at an angle of 30^@ with horizontal . To make the reflected ray vertical , at what angle with horizontal must a plane mirror be placed ?

On a plane mirror, a ray of light is incident at an angle of 30^@ with horizontal . To make the reflected ray vertical , at what angle with horizontal must a plane mirror be placed ?

rays of light strike a horizontal plane mirror at an angle of 45^(@) . At what angle should be a second plane mirror be placed in order that the reflected ray finally be reflected horizontally from the second mirror.

rays of light strike a horizontal plane mirror at an angle of 45^(@) . At what angle should be a second plane mirror be placed in order that the reflected ray finally be reflected horizontally from the second mirror.

A ray of light is incident at an angle of 60^@ on a horizontal plane mirror. Through what angle should the mirror br tilted to make the reflected ray horizontal ?