# L 32 Light in addition to Optics [2] VISIBLE LIGHT Reflection in addition to refraction at a surface Different colors are refracted (bent) by different amounts this effect is called DISPERSION >> The rainbow

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## L 32 Light in addition to Optics [2] VISIBLE LIGHT Reflection in addition to refraction at a surface Different colors are refracted (bent) by different amounts this effect is called DISPERSION >> The rainbow

Strauss, Bob, Film Critic has reference to this Academic Journal, PHwiki organized this Journal L 32 Light in addition to Optics [2] Measurements of the speed of light The bending of light  refraction Total internal reflection Dispersion Dispersion Rainbows Atmospheric scattering Blue sky in addition to red sunsets Mirrors VISIBLE LIGHT Color WAVELENGTH OR FREQUENCY Wavelength Frequency = c (speed of light) = 3 x 108 m/s Reflection in addition to refraction at a surface Incident Light ray reflected Light ray refracted Light ray Normal line Index of refraction n = v/c

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The index of refraction (n) depends of the color (wavelength) of the light 1 nanometer (nm) = 1 109 m Different colors are refracted (bent) by different amounts this effect is called DISPERSION >> Glass prism White light red violet contains all wavelengths (colors) The rainbow Rainbows are caused by dispersion of sunlight from water droplets which act as tiny prisms

Why is it a rain BOW The drops must be At just the right Angle (42 degrees) Between your eyes And the sun to see The rainbow. This Angle is maintained Along the arc of a Circle. Atmospheric scattering Why is the sky blue in addition to sunsets red It is due to the way that sunlight is scattered by the atmosphere (N2 in addition to O2) Scattering atoms absorb light energy in addition to re-emit it but not at the same wavelength Sunlight contains a full range of wavelengths in the visible region Atmospheric scattering: blue sky Short wavelengths are scattered more than long wavelengths Blue light (short) is scattered 10 times more than red light The light that we see in the sky when not looking directly at the sun is scattered blue light

Atmospheric scattering: red sunset At sunset, the sun is low on the horizon When looking at the sun it appears red because much of the blue light is scattered out leaving only the red Why are clouds white Clouds consist of water droplets in addition to very tiny ice particles The water droplets in addition to ice scatter the sunlight Scattering by water in addition to ice (particles) is very different from scattering by molecules The atoms are smaller than the wavelength of light, but the ice in addition to water particles are larger Scattering by particles does not favor any particular wavelength so the white light from the sun is scattered equally clouds are white! Mirrors reflection Light does not pass thru metals  it is reflected at the surface Two types of reflection: diffuse in addition to specular Diffuse reflection: Fuzzy or no image Specular reflection: Sharp image

The law of reflection The angle of reflection = angle of incidence Incident ray, reflected ray in addition to normal all lie in the same plane image as long as mation by plane mirrors The rays appear to originate from the image behind the mirror. Of course, there is no light behind the mirror this is called a virtual image Mirrors appear to make rooms look larger. You only need a mirror half as tall as you are to see your whole self Homers image Homer

The image of your right h in addition to is your left h in addition to AMBULANCE is painted backward so that you see it correctly in your real-view mirror Spherical or curved mirrors Concave mirror Focus parallel light rays are focused to one point Where is the light bulb light bulb image of light bulb A concave mirror will as long as m a real image of an object placed at twice its focal length at a distance of twice the focal length. It will be inverted in addition to the same size as the object.

convex mirror focus parallel rays diverge from a focus behind the mirror Dish antennas signal from satellite detector at the focal point of the dish Magnifying mirrors when something placed within the focus of a concave mirror, an enlarged, upright image is as long as med. this principle is used in a shaving or makeup mirror Homers image Homer

A concave mirror can provide a magnified image as used in this cosmetic mirror. Convex mirrors: wide angle view Object Image A convex lens provides a wide angle view. Since it sees more, the images are reduced in size. Passenger side mirrors are often of this type with the warning: objects appear further than they actually are”. Because they appear smaller they look further away.

## Strauss, Bob Film Critic

Strauss, Bob is from United States and they belong to Los Angeles Daily News and they are from  Woodland Hills, United States got related to this Particular Journal. and Strauss, Bob deal with the subjects like Motion Pictures

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