a convenience store clerk observes a shopper 4 meters in front of a convex mirro

Question

a convenience store clerk observes a shopper 4 meters in front of a convex mirror. The image of the shopper is located 1.5 meters behind the mirror. The focal length of the mirror is what? a convenience store clerk observes a shopper 4 meters in front of a convex mirror. The image of the shopper is located 1.5 meters behind the mirror. The focal length of the mirror is what? a convenience store clerk observes a shopper 4 meters in front of a convex mirror. The image of the shopper is located 1.5 meters behind the mirror. The focal length of the mirror is what?

Explanation / Answer

here

object distance s = 4 m, image disatance s' = -1.5 m,focal length f = ?

using the formula 1/s + 1/s' = 1/f ==> 1/f = 1/4 - 1/1.5 = => f = -2.4 m

the focal length of convex mirror is - 2.4 m

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