21. Light From a Helium-Neon lase (2-632.8 nm) is incident normally on diffraction grading containing 6000 grooves per centimeter. Find angles at which the first and second order maxima are observed. 22. A light source emits visible light of two wavelengths: 1=430 nm and (A1=510 nm). The source is used in a double-slit interference experiment in which L=1.5 m and d=0.025 mm. Find the separation distance between the third-order bright fringes for the two wavelengths.

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.