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All questions are about the same film with index of refraction 1.3 which is illuminated with...

All questions are about the same film with index of refraction 1.3 which is illuminated with colors red of the wavelength 650nm and blue of 390nm wavelength.

1. This film is positioned with upper surface contacting the air and lower surface contacting oil with index of refraction 1.22. What is the minimum thickness of this film which provide strong reflection in magenta color? (magenta color occurs if you are mixing red and blue)

2. What is the next after minimum thickness of this film which will provide strong magenta reflection?

3. In given conditions, if this film would be extremely thin (say, 5nm), how it would look in reflects light?

4. Now this film is being carefully taken from oil and placed on glass of index of refraction 1.5. What is the minimum thickness providing strong magenta reflection now?

5. What is the next thickness providing strong magenta reflection for the film sitting on the glass?

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