In a Young's double-slit experiment, the slit separation is , the distance from slits to screen is , and monochromatic light of wavelength is used. What is the fringe width of the interference pattern?

Answer and explanation

Correct answer: C.

  1. Step 1: State the formula for fringe width in Young's double-slit experiment: .
  2. Step 2: Convert all quantities to SI units: , , and .
  3. Step 3: Calculate: .
Answer
.
Why not the others: uses ; doubles the fringe width; divides by 4.

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