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Question 9 5.8 pts Many mirrors in optical systems are made with thin film dielectric coatings The following image shows the primary reflections in single coating mirror nair = 1.00 sources 2.00 < n coating < 4.00 nglass = 1.45 ay At the LOWER interface of the film (the interface of the coating and glass), what is the phase change of the wave upon reflection? radians, or 30 Orradians, or 180° o radians, or 90° radians, or 45 O radians, or 0 Question 10 5.8 pts In the above problem, the mirror is designed to reflect light with a wavelength of 626 The thickness of the coating is 43 nm. What is the index of refraction of the coating? Answer to the nearest hundredths place (0.01), nuortio