The critical angle for ethyl alcohol is 47.289° when surrounded by air then. (a) construct the ray diagram, (b) evaluate the RI of the crown glass and (c) evaluate the speed of light in crown glass.

Use Snell's law to find the angle that a beam of light makes with the normal to a class surface, entering from air with angle 44 in degrees, after it refracts and is traveling inside the glass. Assume the index of refraction is 1.5

(a) An opaque cylindrical tank with an open top has a diameter of 2.60 m and is completely filled with water. When the afternoon sun reaches an angle of 31.5° above the horizon, sunlight ceases to illuminate any part of the bottom of the tank. How deep is the tank (in m)? 4 Determine how the depth of the tank is related to the angle of refraction for the geometry described in the question. Drawing a diagram may be helpful. Then apply Snell's law to find the angle of refraction and use it to determine the depth of the water in the tank. m (b) What If? On winter solstice in Seattle, the sun reaches a maximum altitude of 19° above the horizon. What would the depth of the tank have to be (in m) for the sun not to illuminate the bottom of the tank on that day? m

A very large piece of clear ice has a cave man frozen inside it. When viewed at an anglefrom the top of the ice the cave man appears to be 1.00 ft below the surface of the ice.What is the actual depth (in units of inches) of the cave man from the top of the ice?The index of refraction of the ice is 1.309   Do NOT use i for the angle of incidence or r for the refracted angle