1. The corpuscular theory related to
light proposed by Issac Newton in 1675
2. Study of light is known as optics.
3. Light is an electromagnetic
radiation.
4. The particle which is supposed to
travel faster than light is tachyon.
5. Tachyon were discovered by E C G
Sudarshan
6. On rainy afternoon a rainbow is seen
in the east.
7. A rain bow is always seen the
opposite direction of sun.
8. Rainbow is caused by reflection,
refraction and dispersion of light by water particles present in the
atmosphere.
9. LASER is Light Amplification by
Stimulated Emission of Radiation
10. Laser is surface intense radiation
11. LASER was discovered by Theodore
maiman in 1960.
12. Visible spectrum is the band of colors
obtained when a ray of light passes through a prism.
13. Spectrum consist of seven colours
14. Violet light is scattered most, blue
somewhat less and green, yellow and orange still less, in that order.
15. Red light is scattered least.
16. The reddish colour of the sun at the
time of rise and set is due to scattering of light by tiny particle in the
atmosphere.
17. Mirage is an optical illusion which is
observed usually in deserts on hot summer days. Land heating contributes in the
formation of a mirage.
18. Principle of optical fiber is total
internal reflection.
19. The beautiful colour of the soap foam
and oil spread water is due to interference of light.
20. The branch of physics which deals with
the measurement of light by object is called photometry.
Green, red and blue
are called primary colours, they give other colour when suitably mixed. The
main secondary colors yellow, cyan (pea cock blue) and magenta.
Red + green = Yellow
Red + Blue = Magenta
Green+ blue = Cyan
Red + Green +blue =
White
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