30. Figure shows two plane mirrors parallel to each other and an object O placed between them. Then the distance of the first three images from the mirror M2 will be: (in cm) 5cm 15cm M (1) 5, 10, 15 (3) 5,25,35 M (2) 5, 15, 30 (4) 5, 15, 25 31. When a plane mirror is placed horizontally on a level ground at a distance of 60m from the foot of a tower. Light rays from the top of tower falling just on the nearer edge of the mirror suffers a deviation of 90. The height of the tower will be: (1) 30 m (2) 60 m (3) 90 m (4) 120 m 32. A ray gets succesively reflection from two mirrors inclined at an angle of 40. If the angle of incidence on the first mirror is 30 then the net deviation of this ray after two reflections. (1) 40 (2) 280 (3) 90 (4) 240 33. Following figure shows the multiple reflection of a light ray along a glass corridor where the walls are either parallel or perpendicular to one another. If the angle of incidence at point P is 30, what are the angles of reflection of the light ray at points Q, R, S and T respectively :- R S T P S (1) 30, 30, 30, 30 (2) 30, 60, 30, 60 (3) 30, 60, 60, 30 (4) 60, 60, 60, 60