Pick the right answer, quickly

Exercise and reference answers

Questions

1. Question

   A converging lens is:

   Choices

   1. Convex
   2. Concave
   3. Plane

   Correct choice

   Convex

2. Question

   The power of a concave lens is:

   Choices

   1. Positive
   2. Negative
   3. Zero

   Correct choice

   Negative

3. Question

   The unit of lens power is:

   Choices

   1. Metre
   2. Dioptre
   3. Newton

   Correct choice

   Dioptre

4. Question

   Refractive index of water:

   Choices

   1. 1.00
   2. 1.33
   3. 1.50

   Correct choice

   1.33

5. Question

   One dioptre means a focal length of:

   Choices

   1. 1 cm
   2. 1 metre
   3. 1 km

   Correct choice

   1 metre

Instructions

Tap the correct answer before the round moves on.

Explanation