This and the next question are about the following situation: An object is place

Question

This and the next question are about the following situation: An object is placed between the focal point and a concave mirror Which of the dashed lines is NOT useful for locating the image? A B C Which one of the following statements is true? This configuration produces a virtual image because the mirror has a negative focal length. This configuration produces a real image because the mirror has a positive local length. This configuration produces a real image because the object distance is positive. This configuration produces a virtual image because the object distance is negative. This configuration produces a virtual image because the image distance is negative. When a person holds a concave mirror 20 cm from his/her face, he/she sees an upright image of his/her which is enlarged by a factor of two. Determine the focal in cm) of the spherical mirror. 4.5cm 10cm 14cm 25cm 40cm

Explanation / Answer

23

A

24

D

25

do = object distance = 20 cm

m = 2

- di/do = 2       since m = - di/do

- di/20 = 2

di = - 40 cm

using the mirror equation

1/di + 1/do = 1/f

1/(-40) + 1/20 = 1/f

f = 40 cm

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