1.A lens  forms a real image 3 cm high of an object 1 cm high. If the separation of object and image is 15 cm , find the focal length of the lens?
 
2. A lens of focal length 20 cm is used to produce a ten times magnified image of a film slide on a screen. how far must the slide be placed from the lens?

Asked by yashpalguglani | 19th Nov, 2016, 02:49: PM

Expert Answer:

1. 
 
2. 

Answered by Yashvanti Jain | 21st Nov, 2016, 11:21: AM