1.

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.

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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