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(a) A light wave is reflected from a mirror. The incident & reflected wave superimpose to form stationary waves. But no nodes & antinodes are seen, why?

(b) A standing wave is represented by y=2ASinKxCoswt.If one of the component wave is y1 = ASin(ωt-kx), what is the equation of the second component wave?

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(a) As is known, the distance between two successive nodes or two successive antinodes is π/2. The wavelength of visible light is of the order of 10-7m.as such as a small distance cannot be detected by the eye or by a ordinary optical instrument. Therefore, nodes and antinodes are not seen.

According to superposition principle,

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