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Q.

An object of size 7.5cm is placed in front of a convex mirror of radius of curvature 25cm at a distance of 40cm. The size of the image should be

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a

1.78cm

b

0.8cm

c

2.3cm

d

1cm

answer is B.

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Detailed Solution

By using
  IO=ff−u ⇒I+(7.5)=(25/2)252−(−40)⇒I=1.78cm

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An object of size 7.5cm is placed in front of a convex mirror of radius of curvature 25cm at a distance of 40cm. The size of the image should be