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What should be the approximate thickness of a commonly used MgF2 (n = 1.38) dielectric film coated on photographic lenses to ensure maximum transmission at the center of the visible spectrum (5500 Å)?

Options

  1. A100 Å
  2. B500 Å
  3. C1000 Å
  4. D1500 Å

Correct answer

C. 1000 Å

Step-by-step solution

Correct Option is : (C) 1000 Å

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