A blind is pulled down to cover a window but it has a pinhole in it that is allowing sun to enter the room. On a wall that is 2.70 m away you can see a circular diffraction pattern from the pinhole. The central maximum of this circular diffraction has a diameter of 0.500 cm. What is the diameter of the pinhole? (Hint: The average wavelength of sunlight is 550 nm.)

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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.