Lesson Notes By Weeks and Term v4 - SHS 3
WAVE
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
WAVE
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Physics
Class: SHS 3
Term: 1st Term
Week: 20
Grade code: 3.2.2.LI.1
Strand code: 2
Sub-strand code: 2
Content standard code: 3.2.2.CS.2
Indicator code: 3.2.2.LI.1
Theme: ENERGY
Subtheme: WAVE
This page supports the lesson note with a companion video and a short classroom-ready summary.
For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.
This lesson introduces a special and powerful type of light known as LASER. While we are familiar with ordinary light from the sun, light bulbs, and candles, laser light has unique properties that make it incredibly useful in modern technology. From the barcode scanners we see in supermarkets like Melcom and Shoprite, to tools used by surveyors on construction sites in Accra and Kumasi, and even in advanced medical procedures in hospitals like Korle-Bu, lasers are all around us. Understanding the properties of lasers helps us appreciate how scientists and engineers have harnessed the power of light waves to solve real-world problems.
A. What is a LASER?
The word LASER is an acronym that stands for:
Light Amplification by Stimulated Emission of Radiation
In simple terms, a laser is a device that produces a very special, organized, and powerful beam of light. Unlike a light bulb that releases light energy in a chaotic way, a laser machine organizes light waves, making them work together in a coordinated manner. This organization gives laser light its unique properties. B. Comparing Laser Light and Ordinary Light