the mirror bet LLI mirror and onward past end location) is where to be coming im
ID: 1606000 • Letter: T
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the mirror bet LLI mirror and onward past end location) is where to be coming image extrapolated past the the the incoming ught coming the nimm the lens location. So, that place (the mirror. if from: that's the object location for the Place the object and the white-glass image screen about 80 or 90 cm. apart. Mount the convex lens near the mail object and adjust its position for a clear image on the image screen. Once you have determined where the image formed by the lens is, move any of these objects until you finish both sections of this part, or you will have to start over. (Things are easier if these are all at the same height.) A Focal length by coincidence method: Place the cardboard screen at (barely below) the object light, Now place the convex mirror between the lens and the image screen and adjust its position so that a sharp image will the cardboard screen. You need to position the mirror so it reflects light back through (not past) the lens toward light source. As in IB, you are arranging matters so that the mirror causes the light rays to return along same path as they came in on (so an image is formed at the same location as the light source). Since the incident and reflected rays coincide, they must both be perpendicular to the mirror surface; they must be radial ince you know they meet, that must be the center and so you can measure the radius (and give it the proper sign), and calculate f Move, then reposition the mirror to get a second and a third determination of R. Their average should give a good value for reposition the convex mirror B. Focal length from a real image: Move the cardboard to align with the lens. Now cardboard at its new between the lens and the white-glass image screen so that a clear image is formed on the position. This is a real image and you can measure its distance from the mirror, you know where the incoming dig would have met, that gives object distance. Now use the mirror equation to get f, it should be about the same (and should be negative) as in 2A, if you treated all the signs right. QUESTIONS: 1. Explain why the distance from mirror to object is the radius of curvature in part lB. 2. Explain how the focal length of a convex mirror is obtained by the coincidence method. 3. Explain how the focal length of a convex mirror is obtained by the method in part 2B. PHYSICSExplanation / Answer
mirror is focused towards a distance object. screen is placed before tthe mirror. By adjusting the screen we get a clear image on the screen. Now the distance between mirror and screen is equal to rough focal length of the mirror.
A net is illuminated with lamp and used as the obbject. It is placed at distance(u) greater than the rough focal length. light rays from net are incident on the mirror and reflected back. In the path of reflected rays screen is placed. Adjusting the screen distance we get a clear image on the screen. the distance between the mirror and screen is equal to image distance (v). The focal length of the mirror is f=uv/(u+v).
For the different values of 'u' image distance 'v' is measured. Focallength f is calculated. The average value of f is the accurate value of the focallength.
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