A 4.00-m-long pole stands vertically in a freshwater lake having a depth of 2.85 m. The Sun is 42.0° above the horizontal. Determine the length of the pole's shadow on the bottom of the lake. Need Help? Read It Watch It
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- 3. A ray of light crosses from a flint glass slab at 20° from the normal into air. At what angle does it emerge?21.15 A person lying on the bottom of a pool notices that he can see all of the above-water surroundings. The view is distorted and compressed, but everything is visible that could be seen from the surface of the water. What is the angular diameter of this view?A spotlight is on the ground 20 ft away from a wall and a 6 ft tall person is walking towards the wall at a rate of 2.5 ft/sec. How fast is the height of the shadow changing when the person is 8 feet from the wall? (A) -2.0833 B) -0.5433 C) -0.4533 D) -2.0444
- 8. Light strikes the 70° glass prism (n = 1.51) with an angle of incidence of 50.0°. Calculate the angle that the light leaves the prism. (73.9°) 70d 9. Light is incident on an equilateral Lucite prism (n = 1.5) at an angle of 35°. Calculate the angle that the light leaves the prism. (66°) %3D ? 10. Freddie the fish shines his flashlight upward from under water. If Freddie shines his flashlight at an incident angle of 20°, at what angle does the light leave the water? (27°) В. A. Beyond what critical angle will the light no longer be able to leave the water? (48.8°) 11. From inside an aquarium a ray of light is directed at the glass so the angle of incidence, in water, is 30°. (a) Determine the angle of refraction when the ray emerges from the glass into the air. (b) If the angle of incidence in the water is 52° at what angle will the rays emerge from the glass? (42°, no ray emerges) water air n = 1.33 n = 1.00 30° glass n = 1.50Rays of the Sun are seen to make a 33.0∘ angle to the vertical beneath the water. At what angle above the horizon is the Sun?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?