Available Answers

1. 1.

   Write true or false for each statement:

   1. The image formed by a plane mirror is real.
   2. When a light ray is reflected from a wall, the angle of incidence is not equal to the angle of reflection.
   3. The image of the right hand in a plane mirror looks like that of a left hand.
   4. The image formed by plane mirror is upright.
   5. The image formed by a plane mirror can be obtained on a screen.
   6. The objects around us are seen due to irregular reflection of light.
   7. The speed of light in vacuum is 3 x 10⁸ m s^-1.
   8. A rose appears red in light of all the colours.
   9. A black paper absorbs light of all the colours and reflects none.
   10. The primary colours are red, blue and green.
2. 2.

   Fill in the blanks:

   1. Angle of incidence = _______________.
   2. The incident ray, the reflected ray and the normal lie _______________.
   3. The image formed by a plane mirror is at a distance behind the mirror as  _______________.
   4. The image formed by a plane mirror is _______________ and _______________.
   5. We are able to see the objects around us due to _______________ reflection.
   6. A _______________ image cannot be obtained on a screen.
   7. One surface of mirror is made opaque by _______________ it followed by a thin coating of paint of lead oxide.
   8. A plane mirror ______________ reflect 100 percent light falling on it.
   9. The colour of an opaque object in the colour of of light which _______________.
   10. Magenta, cyan and yellow are the _______________ colours.
3. 3.

   Match the following:

   Column A	Coulmn B
   (a) A light ray passes from air to glass	(i) speeds up
   (b) A light ray passes from glass to water	(ii) reflects red light
   (c) Virtual image	(iii) primary colours
   (d) Red rose	(iv) plane mirror
   (e) Red, green and blue	(v) slows down

    

4. 4.

   Select the alternatives:

   1. A man stands in front of a plane mirror, finds his image to be at a distance of 6 metres from himself. The distance of man from the mirror is:
   2. The angle between the incident ray and the ray reflected from the plane mirror is 70°. The angle of incidence will be:
   3. The image formed by a plane mirror is:
   4. The angle of incidence on a plane mirror is 30°. The angle of reflection will be:
   5. The angle of incidence on a plane mirror is 30°. The angle between the incident ray and the reflected ray is:
   6. The property due to which a light ray striking a surface is returned back into the same medium is called:
   7. A ray of light after reflection from a mirror is known as:
   8. The speed of light is maximum in:
   9. A red rose is seen in green light. It will appear:
   10.  The primary colours are:
5. 5.

   What do you mean by the term reflection of light ?

6. 6.

   How is a plane mirror made ?