A.) Suppose you are using a camera and wish to have a larger image of a distant
ID: 2298094 • Letter: A
Question
A.) Suppose you are using a camera and wish to have a larger image of a distant object than you are obtaining with the lens currently in use. Would you change to a lens with a longer or a shorter focal length? Explain your reasoning. (Hint: Note that the object distance is essentially fixed.)
B.) Suppose you are using a slide projector and wish to obtain a larger image on the screen. You cannot achieve this by moving the screen farther from the projector because you are already using the entire length of the room. Would you change to a lens with a longer or a shorter focal length than the one you are using? Explain your reasoning. (Hint: Note that the image distance is essentially fixed.)
Explanation / Answer
a) Camera has a convex lens system. Hence , we have M = f2/f1 . Since f1 is fixed , greater f2 means greater M (magnification). Hence we use a lens with LARGER focal length.
b ) we require lens of SMALLER focal length , in this case we have m=f1/f2 , f1 is fixed ,so lesser the f2 greater the magnification
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