ii) A converging mirror forms a real image of height 4 cm of an object of height 1 cm placed 20 cm away from the mirror.
a) C

2 thoughts on “ii) A converging mirror forms a real image of height 4 cm of an object of height 1 cm placed 20 cm away from the mirror.<br />a) C”

1. Answer:

   h2 = – 4 cm (real iamge)

   h1 = 1 cm

   u = – 20 cm

   (i) v = ?

   m = h2/h1 = – (v/u)

   ⇒ -4/1 = -(v/-20)

   ⇒ v = -80 cm

   Image forms in front of the concave mirror.

   (ii) f = ?

   1/v + 1/u = 1/f

   1/-80 + 1/-20 = 1/f

   1/f = – (1/80) – 1/20 = (-1 – 4)/80 = – (5/80)

   f = – 16 cm

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