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Which items are used to form the narrow, uniform slit?

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Question

Which items are used to form the narrow, uniform slit?

Options

  • A clear glass electric bulb

  • A straight, thin filament

  • Red and blue colour filters

  • Two clean razor blades

MCQ
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Solution

Two clean razor blades are held together with a gap between their edges. That gap forms the narrow, uniform slit.

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