Question 1

Thin films of oil on water often appear in bright colors. Assume a thin layer of an oil of index of refraction 1.6 is spread over water (index of refraction 1.3). One portion of this film appears green ( = 510 nm) when viewed from above. Which of the numbers below gives a possible thickness for this portion?

• A. 255 nm
• B. 127.5 nm
• C. 79.7 nm
• D. 239 nm
• E. 96 nm
• F. More than one of the above

Formula Sheet

Question 2

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