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Q. Give any two differences among Peltier effect and Joule's law of heating.
Joule's law of heating
Peltier effect
Takes place all through the conductor.
Occurs at the junctions.
Heat produced is proportional to the square of the current.
Heat produced or else absorbed is proportional to the current.
Irreversible process.
Reversible process
Q. A Plano-convex lens of radius 3 m is placed on a flat glass plate and is illuminated by monochromatic light. The radius of the 8th dark ring is 3.6 mm. Calculate the wavelength
Q. Explain Rayleigh's criterion of just resolution of two spectral lines of equal intensities giving suitable intensity distribution carves. Show how the resolving power of a pla
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