Photography Optics: A 35-mm digital camera using a standard 50.0 mm lens is focused on a 1.80 m tall person who is standing 3.25 m from the lens. You now refocus the camera on a 15.0 cm tall flower that is 75.0 cm from the lens.(a) In refocusing, by how much did you move the lens? Did you move it toward the film or away from it?(b) What is the height of the flower's image on the CCD sensor?
What will be an ideal response?
(a) 2.79 mm, away from the film (b) 10.7 mm
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Iron is observed in the Sun's ________
Fill in the blank(s) with correct word
You are standing on a sidewalk. There is a car in the distance. The horn on the car sounds. You hear it at a pitch that corresponds to a sound frequency lower than the frequency emitted by the horn. What can you conclude?
A) The wind has a component of its velocity in a direction toward you. B) The car is moving on a line directly away from your present location. C) The wind has a component of its velocity in a direction away from you. D) The car has a component of its velocity in a direction away from you. E) Either A or C must be true.
Why is oxygen the most common element in Earth's crust, but not in Earth as a whole?
What will be an ideal response?
A ray of white light, incident upon a glass prism, is dispersed into its various color components. Which one of the following colors experiences the greatest angle of deviation?
a. orange b. violet c. red d. green