A boy is 1.8 m tall and can see his image in a plane mirror fixed on a wall. His eyes are 1.6 m from the floor level. The minimum length of the mirror required to view his complete image is :

A ray of light strikes a silvered surface inclined to another one at an angle of 90° then the reflected ray will turn through :

Two plane mirrors are inclined at an angle of 75° to each other. Find the total number of images formed when an object is placed as shown in figure.

Find the velocity of the image with respect to ground of a moving object in situation as shown in figure :

By what angle mirror should be rotated to obtain reflected ray on +y-axis :

A clock hung on a wall has marks instead of numerals on its dial. On the adjoining wall, there is a plane mirror and the image of the clock in the mirror indicates the time 7 : 10. Then the time on the clock is :

Two mirrors at an angle θ produce 5 images of a point. The number of images produced when θ is decreased to 30° is