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22 Transverse, non-mechanical waves

Created by vibrating electric

charges

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All EM waves travel at All EM waves travel at 3.00 x 108 m/s

**In a vacuum

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Putting the spectrum to use!

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Branch of physics Branch of physics dealing dealing withwith the the

nature and nature and properties of light properties of light

and vision.and vision.

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Light Light WavesWaves

•Transverse waves

•Non-mechanical Waves

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The Spectrum of The Spectrum of Visible LightVisible Light

The visible part of the spectrum may be further subdivided according to color, with red at the long wavelength end and violet at the short wavelength end.

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Light comes Light comes in units in units called called

Photons.Photons.

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•White light White light is a mixture is a mixture of all colors of all colors of lightof light

•The color of The color of light is light is determined determined by the by the wavelength.wavelength.

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PPrimrimararyy

CColoolorsrs ofof

LigLightht

•Red•Green•Blue

                                                                                                                                               

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Two Types of Two Types of ReflectionReflection

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Law of Law of ReflectioReflectio

nnThe angle of which the ray hits the surface is equal to the angle from which it is reflected.

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Each individual ray follows the law of

reflection.

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Curved Mirrors

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Refraction of Light

• Refraction occurs when light’s velocity changes

• Remember: The speed of light is different in different materials.

• As light travels from one material to another, it is bent….this is called refraction.

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Convex Lens2288

Concave Lens2299

Farsightedness or hyperopia is the inability of the eye to focus on nearby objects. The farsighted eye has no difficulty viewing distant objects.

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The lenses in eyeglasses bend light

waves by means ofA diffraction

B interferenceC reflectionD refraction

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