Physics (Essay) Paper 2 WASSCE (SC), 2020

Question 7

 

 

State three properties of lasers that make them preferable to ordinary light beam.

Observation

 

        

Many candidates were able to answer the question correctly.

The expected answer is:

Properties of laser beams that make them preferable to ordinary light beam

-           Travels a very long distance without losing its intensity
-           Has a very narrow optical bandwidth
-           Can be emitted continuously
-           Gives more intense light/power

    -           Is monochromatic