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Refraction

This document discusses the concept of light refraction, explaining how light bends when transitioning between different mediums such as air, water, and glass. It includes objectives for understanding refraction, the speed of light in various mediums, and practical applications of refraction in everyday life, such as lenses. Additionally, it provides activities for drawing ray diagrams and identifying transparent materials.

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18 views9 pages

Refraction

This document discusses the concept of light refraction, explaining how light bends when transitioning between different mediums such as air, water, and glass. It includes objectives for understanding refraction, the speed of light in various mediums, and practical applications of refraction in everyday life, such as lenses. Additionally, it provides activities for drawing ray diagrams and identifying transparent materials.

Uploaded by

tastepawsitive
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Unit 6: Light

Refraction
Objectives
Describe how light is refracted at the boundary between air
and glass or air or water.

Describe how light changes speed when it passes between


different substances.

Draw ray diagrams to show how light is refracted.


Review: Look at the diagram below.
1. What is ray A?

2. Draw the normal.

3. Draw the reflected ray.

4. Label the angle of incidence


and angle of reflection.
A
Getting started:
1. List as many transparent materials as you can.

2. Why do you think you


cannot see clearly when
through a glass of
water?
Refraction
The background, through the wet
window, appears distorted.

It appears distorted because of


refraction.

Refraction is the bending of light air


when it travels from medium to
another medium.
water
Speed of light
Medium Speed of light in km/s
air 300 000
water 225 000
glass 200 000
Light passing from air into water or glass
Light slows down when it passes Incident air
from air to water - changes direction ray
normal
The light passing from air into
glass or water is bent towards
the normal. water

The angle of incidence is greater refracted


than the angle of refraction. ray
Light passing from water or glass into air
Light speeds when it passes from
air
water to air - changes direction
normal
The light passing from glass or refracted
water is bent away from the ray
normal. water

The angle of refraction is greater Incident


than the angle of incidence. ray
Refraction in everyday life
Refraction can stop us from
seeing clearly through wet
windows.

Refraction can also be useful. Lenses


are used in our eyes, in cameras and in
glasses that people wear.

A lens is a curved piece of glass that is


designed to refract light in a known
way

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