The index of refraction of air is 1 the index of glass 1.55, Ask an Expert

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Q1. A fish and a sailor look at each other through a 5cm thick glass porthole in a submarine. There happens to be a small air bubble right in the center of the glass. How far behind the surface of the glass does the air bubble appear the fish? And to the sailor? The index of refraction of air is 1, the index of glass 1.55 and the index of water 1.33. Characterize the air bubble as a point source.

Q2. A diffraction grating with 400,000 lines per meter is illuminated by 0.50[μm] yellow light. What is the angular separation between second and third bright spots (on the same side of the central ray)?

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