Question

4. An object is placed at a distance of 30 cm in front of a convex mirror of focal length 15 cm Write four characteristics of the image formed by the mirror

Answer 1

u = -30 cm

f = 15 cm

1/v + 1/u = 1/f

1/v + (1/-30) = 1/15

1/v - 1/30 = 1/15

1/v = 1/15 + 1/30

1/v = 2+1 / 30

1/v = 3/30

1/v = 1/10

v = 10 cm

Four characters of the image formed by the mirror are :

• It is smaller than the size of the object.
• It is virtual.
• It is erect.
• It is diminished