Phenomenon of Light

Phenomenon of Light:

Phenomenon	Visible Effect
Refraction of light	Day is lengthened (4 min due to atmosphere refraction) Stars appear to twinkle Mirages are formed Sun or moon appears larger in size when at horizon Pencil in the beaker appear broken Stick immersed in water appears bent at the point of separation A person standing inside water appears shorter Writing on a paper appear lifted when glass slab is placed over the paper.
Dispersion of light	Deviation of light passes through a prism Rainbows are formed
Interference of light	Beautiful colours are seen in soap bubbles and oil films on water
Scattering of light rays of small wavelengths	Sky appears blue Clouds appear white Sun appears red during sunrise and sunset
Total internal Reflection	For mation of mirages in desert Air bubbles in glass paper weight appear silvery white Sparkling of diamond

Facts to Remember:

Facts to Remember
The speed of light	186,000 miles per second (or)  3X 108 m/s
Colour of light with smallest wavelength	Violet
Colour of light with longest wavelength	Red
Colour which scatterd most and which scatter least	Most - Violet Least- Red
Colour which deviates more and which deviates less	Most - Violet Least - Red
Three dimensional imaging using interference of light is known as	Holography
System of light excitation used in surgeries, printers etc	LASER
The colour of light which is most conducive to photosynthesis	Blue
The study of properties and behaviour of light is known as	Optics