Reading the laws back

Exercise and reference answers

Questions

1. Question

   The law of reflection states

   Choices

   1. sin i / sin r = n
   2. ∠i = ∠r′
   3. 1/v + 1/u = 1/f

   Correct choice

   ∠i = ∠r′

2. Question

   Snell's law states

   Choices

   1. ∠i = ∠r′
   2. P = 1/f
   3. sin i / sin r = n

   Correct choice

   sin i / sin r = n

3. Question

   The incident ray, refracted ray and normal

   Choices

   1. lie in the same plane
   2. are mutually perpendicular
   3. lie in different planes

   Correct choice

   lie in the same plane

4. Question

   Splitting white light into colours is called

   Choices

   1. diffraction
   2. dispersion
   3. reflection

   Correct choice

   dispersion

Explanation