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

Asked by P S Lakshmi | 4th Mar, 2015, 12:49: PM

Expert Answer:

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.

Answered by Yashvanti Jain | 11th Dec, 2017, 05:37: PM