The lens formula relating the image distance, p , to the focal length, f , and object distance, s , is
The magnification of a lens is
A movie projector is equipped with a 0.5-m focal length lens that is positioned 0.505 m in front of the film. The distance in front of the lens that a screen must be placed for an image to be in focus is 50.5 m.

Question

The lens formula relating the image distance, p , to the focal length, f , and object distance, s , is  
The magnification of a lens is  
A movie projector is equipped with a 0.5-m focal length lens that is positioned 0.505 m in front of the film. The distance in front of the lens that a screen must be placed for an image to be in focus is 50.5 m.

Quizplus · Accepted Answer

The Answer of The lens formula relating the image distance, p , to the focal length, f , and object distance, s , is  
The magnification of a lens is  
A movie projector is equipped with a 0.5-m focal length lens that is positioned 0.505 m in front of the film. The distance in front of the lens that a screen must be placed for an image to be in focus is 50.5 m.

The Lens Formula Relating the Image Distance, P , to the Focal