Available Answers

1. 1.

   State whether the following statements are true or false. Rewrite the false statements correctly.

   1. Light travels at a lower speed in water than in air.
   2. Light travels in a straight line -path while passing through different media.
   3. The angle formed between the normal and the refracted ray is known as the angle of fraction.
   4. At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
   5. Images are formed by a mirror due to reflection.
   6. It is the light that change when it passes from one medium to another.
   7. In an equilateral prism, the angle of prism is 60°.
2. 2.

   Fill in the blanks :

   1. Sensation of sight is produced by _______________.
   2. Light is a form of _______________.
   3. Light travels in a straight line. This property of light is known as _______________ of light.
   4.  Between water and glass, _______________ is the optically denser medium.
   5. A band of seven colours formed by the dispersion of white light is called _______________.
   6. A rainbow is formed when tiny drops of water suspended in the air act as _______________.
3. 3.

   Tick the appropriate answer :

   1. The speed of light in air or vacuum is
      1. 3 x 10⁸ m/s
      2. 2.25 x 10⁸ m/s
      3. 332 m/s
      4. 2.8 x 10⁸ m/s
   2. A ray of light moving from an optically rarer to a denser medium
      1. bends away from the normal.
      2. bends towards the normal.
      3. remains undeviated.
      4. none of the above.
   3. The angle between the normal and refracted ray is called
      1. angle of deviation.
      2. angle of incidence.
      3. angle of refraction.
      4. angle of emergence.
   4. The property of splitting of white light into its seven constituent colours is known as :
      1. interference
      2. diffraction
      3. reflection
      4. dispersion
   5. From a white light, the colour which deviates the least is
      1. violet
      2. red
      3. orange
      4. blue
   6. Rainbows are formed due to
      1. reflection of light.
      2. refraction of light.
      3. dispersion of light.
      4. rectilinear propagation of light.
4. 4.

   Differentiate between Reflection of light and Refraction of light.

5. 5.

   Differentiate between Angle of incidence and Angle of refraction.

6. 6.

   Differentiate between Incident ray and Refracted ray.