# Bragg's Equation

**Bragg's Equation**

This equation gives a simple relationship between the wavelength of X-rays and the distance between the planes in the crystal and the angle of reflection. The equation may be written as:

where n = order of reflection; in general it is taken as = wavelength of X-rays, d = distance between two layers of the crystals and =angle of incident light.

**Example 1:**

Inter planar distance between two layers is in a crystal. Calculate the angle of reflection for first order reflection. X-rays of wavelength are diffracted by the crystal.

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