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A 650 nm laser is pointed at the edge of a knife in such a way...

  1. A 650 nm laser is pointed at the edge of a knife in such a way that it appears the knife is cutting the beam into two. The knife acts like a single slit (Rather than a double slit) A screen 1.8 m from the knife has the first minimum 3.2 mm from the central axis. How thick is the knife?
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In given problem thickness of knife can be calculate using below formula

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