Sketch on eratosthenes method if two observers are due, Ask an Expert

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Q1. Light is incident upon the surface of water in a level, flat-bottomed glass dish at an angle of 50 degrees to the normal. At What angle will the light emerge from the bottom of the dish? The refractive indices of water and glass are 1.33 and 1.50 correspondingly.

Q2. Sketch on Eratosthenes' method, if two observers are due north and south of each other and are separated by 700 km, what is the circumference of their spherical world if they see same star on their meridian at altitudes of 26 degrees and 47 degrees respectively, and at the exact same time?

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