Author Question: A ray of light travels across a liquid-to-glass interface. If the indices of refraction for the ... (Read 240 times)

imanialler · **on:** Jul 28, 2018

A ray of light travels across a liquid-to-glass interface. If the indices of refraction for the liquid and glass are, respectively, 1.75 and 1.52, what is the critical angle at this interface?
a. 60.3
c. 52.2
b. 30.0
d. Critical angle does not exist.

Question 2

The inside of a house is at 20C on an early morning when the temperature outside is 15C. The next morning the inside temperature is the same, but the outside temperature is now 5C. How much does the energy per unit time lost by conduction through the walls, windows, doors, etc., change for the house from the first morning to the second one.
a. Since the inside temperature stays the same, the loss is the same both days.
b. The loss reduces to 1/3.
c. The loss triples.
d. The loss increases by 5/278 since we need to use the Kelvin scale for this calculation.