Light rays from the Sun make a 30°30° angle to the vertical when seen from below the surface of a body of water. At what angle above the horizon is the Sun?
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- What happens to a light wave when it travels from air into glass? (a) Its speed remains the same. (b) Its speed increases. (c) Its wavelength increases. (d) Its wavelength remains the same. (e) Its frequency remains the same.A 4.00-m-long pole stands vertically in a freshwater lake having a depth of 2.00 m. The Sun is 40.0° above the horizontal. Determine the length of the pole’s shadow on the bottom of the lake.The index of refraction for water is about 43. What happens as a beam of light travels from air into water? (a) Its speed increases to 43c, and its frequency decreases. (b) Its speed decreases to 34c, and its wavelength decreases by a factor of 34. (c) Its speed decreases to 34c, and its wavelength increases by a factor of 43. (d) Its speed and frequency remain the same. (e) Its speed decreases to 34c, and its frequency increases.
- You have enrolled in a scuba diving class and while swimming under water in a nearby lake you look up and note that the Sun appears to be at an angle of 32° from the vertical. At what angle above the horizon does the diving instructor standing on shore see the Sun?You are on a snorkeling trip. Deep below the water, you look up at the surface of the water. Right at sunset, at what angle from the vertical do you see the sun?An underwater scuba diver sees the Sun at an apparent angle of 34.0° from the vertical. What is actual direction of the Sun? (above the horizon)
- An underwater scuba diver sees the Sun at an apparent angle of 34.7º from the vertical. What is the actual direction of the Sun relative to vertical?Sunlight strikes the surface of a lake at an angle of incidence of 59.9°. At what angle with respect to the normal would a fish see the Sun?An underwater scuba diver sees the Sun at an apparent angle of 45 degree about the horizontal. What is the actual elevation of the Sun above the horizontal?
- When the sun is either rising or setting and appears to be just on the horizon, it is in fact below the horizon. The explanation for this seeming paradox is that light from the sun bends slightly when entering the earth’s atmosphere, as shown in Fig. Since our perception is based on the idea that light travels in straight lines, we perceive the light to be coming from an apparent position that is an angle d above the sun’s true position. (a) Make the simplifying assumptions that the atmosphere has uniform density, and hence uniform index of refraction n, and extends to a height h above the earth’s surface, at which point it abruptly stops. Show that the angle d is given by as attached. where R = 6378 km is the radius of the earth. (b) Calculate d using n = 1.0003 and h = 20 km. How does this compare to the angular radius of the sun, which is about one quarter of a degree? (In actuality a light ray from the sun bends gradually, not abruptly, since the density and refractive index of the…A laser beam is directed toward the surface of a block of flint glass at an angle of 49.0° with respect to the normal (a line perpendicular to the surface at the spot where the ray hits the block). Some of the light is reflected and the rest refracted. What is the angle (in degrees) between the reflected and refracted beams?A laser beam is incident on the surface of a block of crown glass at an angle of 34.0° with respect to the normal (a line perpendicular to the surface at the spot where the ray hits the block). Part of the light is reflected and the rest refracted. What is the angle (in degrees) between the reflected and refracted beams?