how to do 7 ?? An object is placed 47.0 cm in front of a convex mirror. If the f

Question

how to do 7 ??

An object is placed 47.0 cm in front of a convex mirror. If the focal length of the mirror is -21.5 cm, find the distance between the object and the final image. cm A convex mirror with a radius of curvature of -26.0 cm is used to form an image of an arrow that is 10.2 cm away from the mirror. If the arrow is 2.30 cm tall and inverted (pointing below the optical axis), what is the height of the arrow's image? (Include the sign of the value in your answer.) The response you submitted has the wrong sign. cm A dental hygienist uses a small concave mirror to look at the back of a patient's tooth. If the mirror is 1.28 cm from the tooth and the magnification is 1.80, what is the mirror's focal length? (Include the sign of the value in your answer.) cm

Explanation / Answer

R = -26 cm , s' = -10.2 cm

hi = -2.3 cm

from mirror formula

2/R = 1/s +1/s'

-2/26 = 1/s -1/10.2

s = 47.34 cm

from lateral mgnification

hi/ho = -s'/s

-2.3/ho = +10.2/47.34

ho = -10.68 cm

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