Complete the definition of lens power

Exercise and reference answers

Missing parts

1. Answer

   1/f

   Choices

   1. 1/f
   2. f
   3. f²

2. Answer

   dioptre

   Choices

   1. dioptre
   2. watt
   3. lumen

3. Answer

   1 m⁻¹

   Choices

   1. 1 m⁻¹
   2. 1 m
   3. 1 cm⁻¹

Complete the statement

The power of a lens is {0}. Its SI unit is the {1}, and 1 D equals {2}.

Explanation