The Lens Formula Relating the Image Distance,p,to the Focal Length,f,and

question 42

Multiple Choice

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.

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