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  • An object is placed at a distance of 20cm before a concave mirror. a real image is obtained at a distance of 40cm from the mirror. calculate focal length

An object is placed at a distance of 20cm before a concave mirror. a real image is obtained at a distance of 40cm from the mirror. calculate focal length

Answers (1)

u=-20 cm

v=-40 cm (real image is formed)

mirror formulae 

1/f = 1/u + 1/v

1/f = -1/20 - 1/40

f= -40/3

=-13.33 cm 

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Safeer PP

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