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Slide 1

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30th May 2012.…read more

Slide 2

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Light ­ Reflection.
· The incident ray goes towards the mirror.
· The reflected ray comes away from the mirror.
· The normal is perpendicular to the point where
the incident ray hits the mirror.
· The angle of incidence is between the incident
ray and the normal.
· The angle of reflection is between the reflected
ray and the normal.
· Angle of incidence = angle of reflection.…read more

Slide 3

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Light ­ Reflection.
· When light reflects from an uneven surface, it
gives a diffuse reflection.
· When light reflects from an even surface, it gives
a regular reflection.
· The image in a plane mirror is ­ the same size as
the object, upright, and virtual.
· Virtual image ­ cannot be formed on a screen
because the rays of light that produce the image
only appear to pass through it.
· Real image ­ can be formed on a screen because
the rays of light that produce it actually pass
through it.…read more

Slide 4

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Light ­ Concave mirrors.
· Concave mirrors curve inwards -> )
· The distance from the mirror to the principal
focus is called the focal length.
· For an object placed behind the principal
focus, a real, inverted image is produced.
· For an object place between the principal
focus and the mirror, a virtual upright image is
produced. The image is behind the mirror and
larger than the object.…read more

Slide 5

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Light ­ Convex mirrors.
· Convex mirrors curve outwards -> (
· A convex mirror always produces a virtual,
upright image that is smaller than the object
and behind the mirror.
· Convex mirrors are used as rear view mirrors
in cars because they produce a wider field of
view than a plane mirror.…read more

Slide 6

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Light ­ Refraction.
· Waves change speed and wavelength when
they cross a boundary between two mediums,
but their frequency stays the same. This
means their direction changes.
· When light enters a more dense substance e.
g. glass, it slows down and bends towards the
· When light enters a less dese substance e.g.
air, it speeds up and bends away from the
· Violet light is refracted the most and red light is
refracted the least.…read more

Slide 7

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Slide 8

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Slide 9

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Slide 10

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