Light of Wave Length L Is Incident on Two Thin

question 130

Multiple Choice

Light of wave length l is incident on two thin films that are in contact and surrounded by air. The top layer is λ/4 thick and has an index of refraction of 1.33. The bottom layer is λ/2 thick and has an index of refraction of 1.50. At normal incidence, the reflected rays that are in phase with each other are

• A) 1 and 2.
• B) 1 and 3.
• C) 2 and 3.
• D) 1, 2, and 3.
• E) None of these is correct.

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