Available Answers

1. 1.

   Choose and write the correct answer(MCQs);

   1. Laws of reflection are:
      1. three 
      2. four
      3. five
      4. two
   2. The angle between the reflected ray and the normal is called the:
      1. angle of incidence
      2. angle of reflection
      3. point of incidence
      4. angle of incident 
   3. Angle of incidence is equal to the angle of reflection:
      1. never
      2. sometimes
      3. always 
      4. in special condition 
   4. ____________ is the coloured part of the eyes:
      1. retina
      2. iris 
      3. pupil
      4. cornea
   5. Our eyes are covered with:
      1. eyelids
      2. ciliary muscles
      3. lens
      4. retina
   6. A system that used by blind persons to read, is called:
      1. Braille system
      2. Louis system
      3. visual system
      4. electronic system
2. 2.

   Fill in the blanks:

   1.  ____________ is an invisible energy which make things visible.
   2. Images are formed by ___________ reflection.
   3. When two mirrors are set at an angle to each other then many __________ are formed.
   4. The rainbow is seen as a large ___________ in the sky with many colours.
   5. Sunlight is a mixture of different ____________.
   6. Our ____________ are shaped like a ball.
   7. The _____________ is a thin tissue that has many layers of cells.
   8. The sense of ____________ and ____________ is more active in blind persons.
   9. Braille system was invented in ____________.
   10. In permanent blindness, the problem starts with ____________.
3. 3.

   Write T for true or F for false:

   1. Nothing is visible in the dark.
   2. A virtual image is always inverted and it can be brought on a screen.
   3. On the rough surface, the reflected rays move in different direction.
   4. In a kaleidoscope all the three strips are of different size.
   5. When we blow soap-bubbles, they appear colourless.
   6. The eye lens is a convex lens.
   7. We should read in a moving bus, or train.
   8. Either the eye lens or cornea has become opaque in curable blindness.
   9. The ray which falls on the reflecting surface or object is called the reflected ray'.
   10. There are seven colours in sunlight.
4. 4.

   What do you understand by reflection of light? Write laws of reflection with picture.
5. 5.

   Describe regular and diffused reflection.
6. 6.

   Is sunlight white or coloured? Give suitable examples and pictures.