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
A) 0.5 m.
B) 0.505 m.
C) 50.5 m.
D) 500 m.
E) 505 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
A) 0.5 m. 
B) 0.505 m. 
C) 50.5 m. 
D) 500 m. 
E) 505 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
A) 0.5 m. 
B) 0.505 m. 
C) 50.5 m. 
D) 500 m. 
E) 505 m.

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