grade 7 physics program of light

. In 1960, Theodore Maiman of Hughes Research Laboratory operated the first laser. In 1962, the first semiconductor laser was in its infanc..

Recombination of the seven colors of the dispersed white light to get white light is known as Recomposition of white light..

Newton's Experiment - Dispersion of Light - Sir Isaac Newton, while studying the images of heavenly bodies formed by a lens, found that the image is colored at its edges. In 1665, to investigate this, he performed an experiment using a prism. Newton darkened his room at Trinity College, C..

Place a prism (P 1 ) on a table and a screen behind it. Allow a narrow beam of light to be incident on the prism (P 1 ). The white light gets dispersed and we obtain a band of seven colors on the screen. Recomposition of the Dispersed White Light Now remove t..

In Young's experiment, let the lights of l = 5.4 x 10 - 7 m and 6.85 x 10 - 8 m be used in turn. Keeping the same geometry, compare the fringe widths in the two case..

24. - In Young's experiment, let the lights of l = 5.4 x 10 - 7 m and 6.85 x 10 - 8 m be used in turn. Keeping the same geometry, compare the fringe widths in the two case..

Nuclear Fission - The process of splitting of a nucleus of a heavy atom into a number of light nuclei with the liberation of large amount of energy and two or three neutrons is called nuclear fission. Example: When U-235 is bombarded by a neutron it splits into barium, krypton and 2.5 neu..

According to Brewster's law, the polarizing angle of incidence i p is m = tan i p or 1.5 = tan i p .. i p = tan - 1 (1.5) = 56.3 0 When light is incident at the polarizing angle of incidence, the reflected beam is perpendicular to the transmitted beam. If r is angle of refraction..

The Sun - The sun is at the center of the solar system. Its mass is about 740 times as great as that of all the planets combined. The huge mass of the sun creates the gravitation that keeps the other objects traveling around the sun in an orderly manner. Sun The sun is a typical star, of intermedia..

of material of prism, then from Snell's law, This formula is called prism formula. Dispersion of light is the phenomenon of splitting of white light into its constituent colors on passing through a prism. The band of seven colors so obtained is called visible spectrum...