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Reflection

This document covers the topic of light reflection, focusing on plane mirrors and the law of reflection. It explains the concepts of incident rays, normal lines, and how to draw ray diagrams to illustrate these principles. The document also provides step-by-step instructions for creating ray diagrams that demonstrate the angles of incidence and reflection.

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20 views13 pages

Reflection

This document covers the topic of light reflection, focusing on plane mirrors and the law of reflection. It explains the concepts of incident rays, normal lines, and how to draw ray diagrams to illustrate these principles. The document also provides step-by-step instructions for creating ray diagrams that demonstrate the angles of incidence and reflection.

Uploaded by

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

Reflection
Learning objectives:
●Describe how light is reflected from a plane surface.

●Understand the law of reflection

●Able to draw ray diagrams to show reflection of light


Why do you
think mirrors
can reflect light
well?
Reflection
Most of the mirrors you use are
plane mirrors. Plane means flat
surface.

Light travels in straight lines called


rays.
Light ray arriving at a surface is called an incident ray. It
makes an angle with the surface of the mirror.

The line perpendicular to the mirror is called normal.

normal

Incident ray
We can use this information to draw ray diagrams.
Ray diagrams follow law of reflection; the angle of
incidence is equal to the angle reflection.

normal

incident ray
reflected ray
Drawing ray diagrams

1. Draw the incident ray


and the mirror.

2. Use ruler to make the


incident ray meet the
mirror.
3. Use a protractor or ruler normal
to draw the normal.

4. Use protractor to
measure the angle
between the incident ray
and and the normal.
5. Measure an angle equal to the angle of incidence on the
other side of the normal. This angle is called the angle of
reflection.
Which letter is the incident ray? How
about the reflected ray?

Reflected ray

Incident ray
Do LB page
193.

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