help me with these questions! A laser beam is reflected by a plane mirror. It is
ID: 1570397 • Letter: H
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help me with these questions!
A laser beam is reflected by a plane mirror. It is observed that the angle between the incident and reflected beams is 38 degree. If the mirror is now rotated so that the angle of incidence increases by 5.0 degree, what is the new angle between the incident and reflected beams? How rapidly does the distance between you and your mirror image decrease if you walk directly toward a plane mirror with a speed of 2.4 m/s? A person 1.6 m tall stands 3.2 m from a convex mirror with f =-4.5cm a. Where is the image of the person, relative to the surface of the mirror? Know p = 3.2m and f = -4.5 times 10^-2m b. How large is the person's image? c. Describe the image. The 200-inch-diameter concave mirror of the Hale telescope on Mount Palomar has a focal length of 16.9 m. An astronomer stands 20.0 m in front of this mirror. a. Where is her image located? b. Is it in front of or behind the mirror? c. Is her image real or virtual? Is it upright or inverted? d. What is the magnification of her image? For the Hale telescope mirror above how, far away are two stars with a separation of 0.1 light years such that the separation on the image formed by the telescope will be 1mm? (Assume the line between the stars is perpendicular to the line of sight from the telescope to one star.) Light travels a distance of 0.960 m in 4.00 ns in a given substance. What is the index of refraction of this substance? A submerged scuba diver looks up toward the calm surface of a freshwater lake and notes that the Sun appears to be 35 degree from the vertical. The diver's friend's standing on the shore of the lake. At what angle above the horizon does the friend see the sun? Two polarizers are at 90 degrees. How many polarizers at equally spaced angles) have to be placed between these two to allow at least 50% of the light intensity to pass through?Explanation / Answer
1)For plane mirror
angle of incidence = angle of reflection
Before rotation of mirror, angle of incidence = angle of reflection = 38/2 = 19 deg
After rotation, angle of incidence = angle of reflection = 19+5 = 24 deg
New angle between incident and reflected beam = 24*2 =48 deg
2) for plane mirror
distance of object from mirror = distance of image from mirror
Rate at which distance between object and mirror image cahnges = 2*2.4 = 4.8 m/s
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