Question: Q 3 . A parallel beam of white light is incident normally on a screen in which a slit of width 0 . 5 mm

Q3. A parallel beam of white light is incident normally on a screen in which a slit of width 0.5 mm has been cut. The light is focused on a screen by a lens of focal length 1.0 m . A pinhole 4 mm from the centre line of the image allows some of the light to pass through the second screen. Find the wavelengths absent from the visible spectrum in this light.
Q 3 . A parallel beam of white light is incident

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