# GCSE Physics: Reflection and Refraction.

These flashcards summaries all you need to know about Reflection and Refraction for the Unit 3 exam, for GCSE Physics (AQA).

There are some relevant diagrams for this topic and these will be in your revision guides or easily accessible on the web. I would reccomend looking at these diagrams as they make these concepts easier to understand.

There is also a small amount of information or Real and Virtual Images.

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## Reflection

When light hits a surface, it changes direction.

THIS IS CALLED REFLECTION.

The normal line is perpendicular to the reflecting surface at the point of incidence.

The normal line is used to calculate the angles of incidence and reflection...

ANGLE OF REFLECTION = ANGLE OF INCIDENCE i = r

PLANE MIRRORS
The image in a plane mirror is:

• the same size as the object
• upright and virtual
• the same distance behind the mirror as the object in front.
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## Refraction

When light crosses an interface (a boundary between two densities) it changes direction.

Unless, it meets the boundary at 90 degrees.

THIS IS CALLED REFRACTION

A triangular prism doesn't have any parallel sides, so a light ray travelling through it is deviated (changes direction).

If the speed is REDUCED, refraction is TOWARDS the normal.
If the speed is INCREASED, refraction is AWAY FROM the normal.

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## Normal and Virtual Images

The difference between Normal and Virtual Images is very easy to understand.

You need to ensure that you are perfectly clear on the difference.

REAL Can be formed on a screen.
The rays of light that form the image, actually pass through it.

VIRTUAL Cannot be formed on a screen.
The rays that form the image, only appear to pass through it.

The names of the two images basically say it all. Real is normal and virtual is imaginary in a way - the rays do not really pass through the image, the only appear to.

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## Questions :)

• What size is the image in a plane mirror? 1
• What is reflection? 2
• What is the angle of reflection equal to? 1
• What is refraction? 2
• What happens in refraction, if the speed is reduced? 1
• What happens in refraction if the speed is decreased? 1

The answers are all within the previous flashcards. Look for the answers yourself, this will greatly help you. It is much more beneficial than simply ticking or crossing.

9 - A*
8 - A
6 - 7 - B
4 - 5 - C
3 and below - C

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Physics requires high Brain IQ

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Thanks

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This is wonderful !

I love the way you also included the questions on the last flashcards with the marks added on. Thank You :)

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Thanks (y)

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THANKSSS

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Thanks so much!

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Really helped, thanks

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Are you stuck on reflection and refraction?

Then perhaps you should read this resource. Specifcially designed for AQA GCSE core Science, it will help you to understand the difference between the two and then you can do a mini test at the end to check your progress.

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