Question

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a man holds a spherical shaving mirror of radius of curvature 60cm and focal length 20cm at a distance of 15 cm from his noise find the position of image and calculate the magnification​

Answer 1

Answer:

Radius of curvature, R = -60cm (concave mirror)

F = -30cm, u = -15cm

We have

1/v + 1/u = 1/f

1/v + 1/-15 = 1/-30

1/v = 1/15 + 1/-30

1/v = 1/30

V = 30 cm

m = - (v/u)

m = - (30/-15)

m = 2

so, the image is formed 30 cm behind the mirror and the magnification is +2.