14 reflection of light
DESCRIPTION
GCE O-Level Physics 5054 sub-topic of Light that deals with the phenomena of reflection.TRANSCRIPT
REFLECTIONTOPIC 14 : LIGHT
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Saturday, March 30, 2013
WAVE BEHAVIOURAs a transverse wave light behave in the following
ways:
Reflected Refracted Diffracted
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REFLECTION OF LIGHTWhen light hits a shiny surface or an opaque surface,
it will be reflected.
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Opaque, rough surfacesSmooth, shiny surfaces
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TYPES OF REFLECTIONThere are two types of reflection
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Diffused Reflection@ opaque, rough
surfacesRegular Reflection@ smooth, shiny
surfaces
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TYPES OF REFLECTION
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Diffused Reflection@ opaque, rough
surfaces
Diffuse Reflection
Incoming light rays are reflected in
different directions.
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TYPES OF REFLECTION
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Diffused Reflection@ opaque, rough
surfaces
Diffuse Reflection
No images are formed / can be observed ‘at’ the
surface.
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TYPES OF REFLECTION
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Regular Reflection@ smooth, shiny
surfaces
Regular Reflection
Incoming light rays are reflected in the
same direction.
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TYPES OF REFLECTION
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Regular Reflection@ smooth, shiny
surfaces
Regular Reflection
Images are formed / can be observed ‘at’
the surface.
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REFLECTION OF LIGHTFocus : Reflection of light waves on straight barriers.
Light incident at an angle
Light incident straight on
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IMAGE FORMATIONby Plane Mirrors
Images are upright and the same size as
the object.
Object
Image
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IMAGE FORMATIONby Plane Mirrors
Images are laterally inverted.
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IMAGE FORMATIONby Plane Mirrors
Images are same distance behind the mirror as the object is in the front.
Saturday, March 30, 2013
IMAGE FORMATIONby Plane Mirrors
Images are virtual.
Image cannot be formed on a screen.Saturday, March 30, 2013
TERMINOLOGIES
April 2000 Waves - 7 Physics@Xinmin
Plane waves reflected from Circular waves reflecting froma plane surface a plane surface
Questions:Complete the diagrams to show the wavefronts that would be reflected from thefollowing barriers.
Effect of Water depth on Waves
In moving from deep to shallow water the water,
the waves will move with a __________________ speed,
the waves’ wavelength will become ___________________ ,
the frequency of the waves will _____________________________.
Incident Angle
Normal
C
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Incident Ray Incident Point
Saturday, March 30, 2013
April 2000 Waves - 7 Physics@Xinmin
Plane waves reflected from Circular waves reflecting froma plane surface a plane surface
Questions:Complete the diagrams to show the wavefronts that would be reflected from thefollowing barriers.
Effect of Water depth on Waves
In moving from deep to shallow water the water,
the waves will move with a __________________ speed,
the waves’ wavelength will become ___________________ ,
the frequency of the waves will _____________________________.
Reflected Ray
Normal
C
Angle of Reflection
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Incident Ray
TERMINOLOGIES
Incident Point
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LAWS OF REFLECTIONAngle of Incidence = Angle of Reflection
The incident ray, the reflected ray and the normal all lie in the same plane.Saturday, March 30, 2013
REFLECTED LIGHT WAVES
April 2000 Waves - 7 Physics@Xinmin
Plane waves reflected from Circular waves reflecting froma plane surface a plane surface
Questions:Complete the diagrams to show the wavefronts that would be reflected from thefollowing barriers.
Effect of Water depth on Waves
In moving from deep to shallow water the water,
the waves will move with a __________________ speed,
the waves’ wavelength will become ___________________ ,
the frequency of the waves will _____________________________.
Angle of Incidence
Angle of Reflection=
Wavelength remains constant
Speed remains constant
Frequency remains constant
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REFLECTION OF LIGHTExtension : Reflection of light waves on curved barriers.
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SUMMARY OF WAVE BEHAVIOUR
WavelengthSpeed
REFLECTION REFRACTION
WavelengthSpeed
Direction
Angle of Incidence
Angle of Reflection=
INCREASE / DECREASE
CONSTANT
TOWARDS / AWAY FROM NORMAL
DEPENDS ON DEPTH OF MEDIUM
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