Reflection, refraction and lenses

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869
Question 42
Easy

The equation that relates the power of a lens to its focal length is:

power (in dioptres)=1focal length (in metres) \text{power (in dioptres)} = \frac{1}{\text{focal length (in metres)}} power (in dioptres)=focal length (in metres)1​

The power of a magnifying lens is 8 dioptres8\text{ dioptres}8 dioptres.

Use the equation to calculate the focal length of this lens in cm\text{cm}cm.

[2]

Reflection, refraction and lenses Questions

  1. GCSE
  2. /Physics
  3. /Reflection, refraction and lenses