A ray of light travelling in the direction i 31 is incident on a plane mirror After reflection it travels along the direction i 3 The angle of incidence is 1 30 2 45 3 60 4 75 An object is approaching a fixed plane mirror with speed 15 ms making an angle of 135 with the normal to the mirror The speed of 6 image w r t mirror is 1 15 ms AS object fixed 2 15 3 15 2 ms 4 30 ms An object is placed at 100 cm from plane 8 mirror It approaches towards mirror with a velocity 8 cm s Calculate magnitude of displacement of image with respect to object in 5 sec 1 60 cm 2 40 cm 3 120 cm 4 80 cm If two mirrors are kept at 60 to each other then the number of images formed by them is 3 5 2 3 4 6 AB is incident wavefront on mirror R and mirror S whereas PQ and P Q is reflected wavefront from mirror R and mirror S respectively Choose the CORRECT statement 1 7 mirar R 31 1 mirror R is concave and mirror S is convex 2 mirror R is plane and mirror S is convex 3 mirror R is plane and mirror S is concave 4 mirror R is convex and mirror S is plane Refer to the figure The number of reflections from mirrors M and M are 1 5 and 5 2 6 and 5 3 10 and 10 4 6 and 6 Plane mirror and an object has speeds of 5 ms and 10 ms respectively If the motion of mirror and object is along the normal of the mirror then the speed of image may be 1 0 ms 3 20ms 2 10 ms 4 Both 1 and 3 A point object O can move along vertical line AB as shown in figure When image of the object is first visible to D then it is released at t 0 from rest The time for which image of object is visible to D is E Vertical plane 5 39 5 10