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f13 is placed alonlength f such the+ touches theExample 12. A thin rod of length f/3 isris of a concave mirror of focal length fimage which is real and elongated, just touchWhat will be the magnification ?of the red nl. |
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Answer» Since the image touches the rod, one end of the rod must be at C of the mirror.Since the image is real and elongated, the other end of the rod must be between C and F of the mirror.The distance of this latter ( A) end from the optic center of the mirror is (R-f/3) = 2f-f/3= 5f/ 3(u –f)= 5f/ 3-f = 2f/3m = f/ (u-f) = 3/2 = 1.5 Magnification of the A end of the rod is 1.5 where as the magnification of the joint of image and rod is 1. |
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