Lesson Notes By Weeks and Term v4 - SHS 1
WAVES
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
WAVES
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Physics
Class: SHS 1
Term: 1st Term
Week: 19
Grade code: 1.2.2.LI.2
Strand code: 2
Sub-strand code: 2
Content standard code: 1.2.2.CS.2
Indicator code: 1.2.2.LI.2
Theme: ENERGY
Subtheme: WAVES
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.
Performance Indicator: By the end of the lesson, the learner will be able to determine the refractive index of a rectangular glass block by experiment and calculation. Core Competencies: Communication and Collaboration (CC), Critical Thinking and Problem Solving (CP), Personal Development and Leadership (PL).
(Content Delivery - 30 minutes) a. What is Refraction and Why Does it Happen?
Refraction is the bending of a wave (in our case, a light wave) as it passes from one medium to another.
Cause of Refraction: Refraction happens because light travels at different speeds in different media. Light travels fastest in a vacuum (empty space). It travels slightly slower in air. It travels much slower in optically denser media like water, kerosene, or glass.
A medium in which light travels slower is said to be optically denser. A medium in which light travels faster is optically less dense. For example, glass is optically denser than air.