Question

A narrow beam of white light is incident at an angle of 25 degrees onto a slab of heavy flint glass 5cm thick. The indices of refraction for 400-nm and 700-nm wavelength are 1.689 and 1.642 , respectively. What is the angular width of the beam as it emerges from the glass? (b) The 5.00-cm slab is now replaced with thin film - with the same indices of refraction as above. What is the minimum thickness for which 400-nm light interferes destructively? What is the minimum thickness for which 700-nm light interferes constructively? (c) Is there such as thickness of the thin film such that the 400-nm light interferes destructively AND 700nm light interferes constructively? If yes, calculate such a thickness. If not, explain why not. * PLEASE ANSWER B AND C *

          A narrow beam of white light is incident at an angle of 25 degrees onto a slab of heavy flint glass 5cm thick. The indices of refraction for 400-nm and 700-nm wavelength are 1.689 and 1.642 , respectively. What is the angular width of the beam as it emerges from the glass?
(b) The 5.00-cm slab is now replaced with thin film - with the same indices of refraction as above. What is the minimum thickness for which 400-nm light interferes destructively? What is the minimum thickness for which 700-nm light interferes constructively?
(c) Is there such as thickness of the thin film such that the 400-nm light interferes destructively AND 700nm light interferes constructively? If yes, calculate such a thickness. If not, explain why not.
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PLEASE ANSWER B AND C ***

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