question_answer

A horizontal fluorescent tube is 80 cm in length. If a square horizontal plane mirror, of each side 20 cm, is placed below the tube at a distacne 200 cm from the tube, such that the perpendicular bisector of the length of the tube passes through the mid-point of the mirror and pair of the sides of the mirror are parallel to the length of the tube, the length of the reflected patch of light on the ceiling, 100 cm above the tube is \[85\times a\]cm the value of a is.

Answer:

2.00