Optical Illusions For each phenomenon, describe the image produced relative to the object and explain the science behind the illusion. Phenomenon | Image produced | Explanation Flattened Sun Mirage light ray from sky light ray from cloud cloud more dense, cool air observer less dense, hot air hot pavement image of cloud Rainbow sunlight (a) water droplet
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When the sun is near the horizon, its light passes through a greater thickness of the Earth's atmosphere, causing the light to be refracted or bent. This bending of light makes the sun appear slightly flattened as it sets or rises. ** Show more…
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A floating strawberry illusion is achieved with two parabolic mirrors, each having a focal length $7.50 \mathrm{cm},$ facing each other so that their centers are 7.50 $\mathrm{cm}$ apart (Fig. P36.76). If a strawberry is placed on the lower mirror, an image of the strawberry is formed at the small opening at the center of the top mirror. Show that the final image is formed at that location and describe its characteristics. (Note: A very startling effect is to shine a flashlight beam on this image. Even at a glancing angle, the incoming light beam is seemingly reflected from the image! Do you understand why?)
Madhur L.
A floating strawberry illusion is achieved with two parabolic mirrors, each having a focal length $7.50 \mathrm{cm},$ facing each other so that their centers are 7.50 $\mathrm{cm}$ apart (Fig. $\mathrm{P} 36.66 ) .$ If a strawberry is placed on the lower mirror, an image of the strawberry is formed at the small opening at the center of the top mirror. Show that the final image is formed at that location and describe its characteristics. Note: A very startling effect is to shine a flashlight beam on this image. Even at a glancing angle, the incoming light beam is seemingly reflected from the image! Do you understand why?
Go to the Astronomy Picture of the Day (APOD) website (http:// apod.nasa.gov/apod), do a search on "molecular clouds," and pick out a few images. Were these pictures obtained from space or on the ground, and at what wavelengths? With which telescopes? What wavelengths do the colors in the images represent? Are they "real" or "false-color" images? Explain your answers.
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