Definition: In physics, a "diffract" is an optical phenomenon where light waves are bent or refracted in response to changes in the direction of propagation. This process can occur because of different media (such as gases and liquids) that act as barriers between two materials when they are allowed to pass through each other. Diffractometers, which are commonly used for measuring the angle of deviation of light from its straight path, are devices that measure the angle of deflection of light waves