An olive is at the bottom of a glass of alcohol (n=1.36). 6.78 cm beneath the surface. Above the alcohol is air. To a person in the air, who is directly above the olive, what is the apparent depth d' of the olive. d'-Number Units

6. A ray of light, emitted beneath the surface of an unknown liquid with air above it, undergoes total internal reflection as shown below. What is the index of refraction for the liquid and its likely identification? 13.4 cm. n₂ n₁ 15.0 cm

3

A soda straw is stuck into water at an angle of 36° to the vertical. Looking straight down, what does the angle of the submerged portion of the straw to the vertical appear to be?

Determine the critical angle for a glass-water interface: the index of refraction of water is n = 1.33 while that of glass is n = 1.52 a. 48.81^0 b. 61.04^0 c. 41.14^0 d. 28.96^0

Glass Face 3 30 60° Face 2 Air Water m. Face 1

MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A mirror hangs 1.80 m above the floor on a vertical wall. A ray of sunlight, reflected off the mirror, forms a spot on the floor 1.07 m from the wall. Later in the day, the spot has moved to a point 2.50 m from the wall. (a) What is the change in the angle of elevation of the Sun, between the two observations?