Question

an object is placed at a distance of 30 cm from a concave mirror of focal length 10cm . calculate the distance of the image from the mirror.

Answer 1

Answer:

15 cm

Explanation:

u= -30 cm

f= 10cm

1/v+1/u=1/f

1/v=1/f - 1/u

   = 1/10 - 1/30

   = 3-1/30

   = 1/15

therefore v= 15 cm

Answer 2

Answer:

15 cm behind the mirror

Explanation:

u= -30 cm

f= 10cm

1/v+1/u=1/f

1/v=1/f - 1/u

  = 1/10 - 1/30

  = 3-1/30

  = 1/15

v= 15 cm

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