Complete the lens power rule

Exercise and reference answers

Missing parts

1. Answer

   one metre

   Choices

   1. one metre
   2. one centimetre
   3. ten metres

2. Answer

   positive

   Choices

   1. negative
   2. positive

3. Answer

   concave

   Choices

   1. convex
   2. concave

Complete the statement

A lens of power one dioptre has focal length {0}. Power is {1} for a converging lens, and a lens marked minus 4.0 D is a {2} lens.

Instructions

Tap a chip for each blank until the sentence about lens power reads correctly.

Explanation