2. Coherent light enters a double-slit apparatus which has been modified such that one of the slits is filled with a bit of glass with an index refraction of 1.25, as shown in the diagram. The thickness of the screen containing the double slit happens to equal the wavelength of the incident plane wave of light. The slits are separated by a distance equal to three wavelengths of the light. Of the light that reaches the glass plug, only a negligible amount is reflected. empty glass plug a. Find the phase difference of the light waves that emerge from the two slits. b. Find the angle at which the first dark fringe is deflected above the center line.

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Diffraction of light

In physics, the term diffraction is defined as the bending of light around the corners of the obstacle. As a light ray passes by an aperture, it bends around the edges or through slits, it spreads out through a narrow opening. The diffracted light will produce fringes of bright and dark or colored bands which are labeled as a diffraction pattern.