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What is dark fringe?
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What is the difference between dark fringe and bright fringe?

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A wedge-shaped thin glass plate of refractive index 1.52 is used to observe fringes of equal thickness. The fringe spacing is 1 mm and the wavelength of light used is 5893 Å. Calculate the angle of the wedge.

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What is wedge-shaped thin film? Obtain an expression for Fringe width of the interference due to reflected rays in wedge-shaped thin film.

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Why is the center of the ring dark?
Answer : The center of the ring appears dark due to **destructive interference** in a phenomenon called **Newton's rings** or other similar interference patterns. This happens when light waves reflect ... This effect is commonly observed in Newton's rings, soap bubbles, and thin-film interference patterns....

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Explain the experimental set-up for the Newton’s rings formation with suitable diagram. Write conditions for dark and bright rings.

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