Question

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6. A concave spherical mirror of focal length 40.0 cm is used to project an image on a screen 5.00 m away. (a) calculate the object distance from the mirror. (b) Calculate the magnification of the image. (c) is the image erect or inverted?

Answer 1

1) using mirror formula,

1/f = 1/v + 1/u

1/u = - 1/40 + 1/500

u = - 43.47 cm

2) magnification,

M = - v/u

M = - 500/43.47

M = - 11.5

3) image is real and inverted.