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4IUf/3 is placed along theample 12. A thin rod of length fl3 is nl.que mirror of focal length f sucreal and elongated, just touches 1oth f such that itstouches the rod.Optic arts of a concise mirrorimage which is real and elong(HIT 93What will be the magnification ?of the red plazo

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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