Two narrow slits separated by 0.50 mm are illuminated by monochromatic light of wavelength 509 nm. How many bright fringes can be seen on a screen 1.1 cm wide placed 1.2 m in front of the slits?

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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.