Quick picks on optics

Exercise and reference answers

Questions

1. Question

   The unit of lens power is the:

   Choices

   1. Dioptre
   2. Diameter
   3. Dilation

   Correct choice

   Dioptre

2. Question

   Total internal reflection is used in:

   Choices

   1. Optical fibres
   2. Ordinary mirrors
   3. Opaque screens

   Correct choice

   Optical fibres

3. Question

   The critical angle matches a refraction angle of:

   Choices

   1. 30 degrees
   2. 60 degrees
   3. 90 degrees

   Correct choice

   90 degrees

4. Question

   Dispersion arises because index varies with:

   Choices

   1. Frequency
   2. Firmness
   3. Fluidity

   Correct choice

   Frequency

Instructions

Tap the correct answer before the round moves on.

Explanation