Wed March 04, 2015 By: P S Lakshmi

1. detemine the focal length of a spherical mirror which forms a 3 times magnified real image of an object placed 16 cm in front of it.
Will m=3 or m= -3 why
2.the image  of an object placed 36 cm from a shpericl lens is formed on a screen at a distace of 72 cm from lens Find its f?
Will v=72 or v= -72  why

Expert Reply
Wed March 04, 2015
1. The magnification, m = - 3 cm. This is because real image is formed.
2. Since image is formed on a screen, it is a real image and v is taken as a positive.
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