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HUMAN EYE AND THE COLORFUL WORLD - Coggle Diagram
HUMAN EYE AND THE COLORFUL WORLD
Refraction through a GLASS PRISM
a triangular
GLASS PRISM
has 2 triangular bases and 3 rectangular lateral surfaces. These surfaces are inclined to each other. the angle b/w its 2 lateral surfaces is called the
ANGLE OF PRISM.
The pecuiar shape of the prism makes the emergent ray bend at an angle to the direction of the incident ray (angle i). This angle so formed is called the
ANGLE OF DEVIATION.
DISPERSION OF WHITE LIGHT BY A GLASS PRISM
The prism has split the incident white light into its constituent colors. (acronym VIBGYOR)
The band of the coloured components of a light beam is called its
spectrum.
The splitting of light into its component colors is called
DISPERSION.
Different colors of light bend through diff. angles with respect to the incident ray, as they pass through a prism. The red light bends the least (most wavelength) while the violet (least wavelength) the most. Thus the rays of each color emerge along diff. paths and thus become distinct. It is the band of distinct colors that we see in a spectrum.
RECOMBINATION OF WHITE LIGHT
Newton placed a 2nd identical glass prism in an inverted position with respect to the 1st prism(when he was trying to split the white light into more colors). Rather he found a beam of white light emerging from the other side of the 2nd prism. This obsevation gave Newton the idea that
sunlight is made up of 7 colors.
any light tha gives a spectrum similar to that of sunlight is often referred to as white light.
Isaac Newton was the 1st to use a glass prism to obtain the spectrum of sunligth.
FORMATION OF RAINBOW
PROCESS
I Refraction
II Dispersion
III TIR
IV Refraction
Rainbow- natural phenomenon appearing in the sky after a rain shower.
You can also a see a rainbow on a sunny day when you look at the sky through a waterfall or through a water fountain, with the sun behind you.
it is caused by the dispersion of sunlight by tiny water droplets, present in the atmosphere.
a rainbow is always formed in the direction opp. to that of the sun.
ATMOSPHERIC REFRACTION
Refraction of light by the earth's atmosphere.
DENSER MEDIUMS
The cooler air layers of the atmosphere behave as optically denser medium for light rays. And has a higher refractive index.
OPTICALLY RARER MEDIUMS
the warmer air layers (or hotter air layers) of the atmosphere behave as optically rarer medium for the light rays. and has a refractive index slightly less than that of the cooler air.
TWINKLING OF STARS
Due to the atmospheric refraction of starlight.
the atmospheric refaction occurs in a medium of gradually changing refractive index.
The starlight, on entering the earth's atmosphere, undergoes refraction continuously before it reaches the earth.
since the atmosphere bends
