14 reflection of light

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

Saturday, March 30, 2013

TYPES OF REFLECTION

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Diffused Reflection@ opaque, rough

surfaces

Diffuse Reflection

Incoming light rays are reflected in

different directions.

Saturday, March 30, 2013

TYPES OF REFLECTION

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Diffused Reflection@ opaque, rough

surfaces

Diffuse Reflection

No images are formed / can be observed ‘at’ the

surface.

Saturday, March 30, 2013

TYPES OF REFLECTION

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Regular Reflection@ smooth, shiny

surfaces

Regular Reflection

Incoming light rays are reflected in the

same direction.

Saturday, March 30, 2013

TYPES OF REFLECTION

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Regular Reflection@ smooth, shiny

surfaces

Regular Reflection

Images are formed / can be observed ‘at’

the surface.

Saturday, March 30, 2013

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.

Saturday, March 30, 2013

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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Saturday, March 30, 2013

REFLECTION OF LIGHTExtension : Reflection of light waves on curved barriers.

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Saturday, March 30, 2013

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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Saturday, March 30, 2013