Available Answers

1. 1.

   In a dark room, a parallel beam of light falls on a plane mirror and another parallel beam of light falls on a white wall. The light reflected by the mirror can be seen only in a certain direction, but the reflected light from the wall can be seen from anywhere. Give reason.

2. 2.

   Complete the diagram in Fig. 7.12 to form the image A'B' of the object AB by the plane mirror MM1. State in words how have you completed the diagram. Measure the perpendicular distance of the points A and B of the object from the mirror and also the perpendicular distance of the points ' and B' of the image from the mirror and state how are they related.

   

3. 3.

   An object is at a distance 25 cm in front or a plane mirror. The mirror is shifted 5 cm away from the object. Find : (i) the new distance between the object and its image, and (ii) the distance between the two positions or the image.

4. 4.

   What do you mean by reflection of light?

5. 5.

   State which surface of a plane mirror reflects most of the light incident on it : the front smooth surface or the black silvered surface.

6. 6.

   Explain the term plane mirror. Draw diagram/diagrams to show them.