Question

3.An object is 20 cm in front of convex mirror. If the image height is 1/5 times the object height, determine (a) the image distance b) the focal length

Answer 1

Answer:

Using magnification formula,

m=−

u

v

=

3

1

⇒v=−

3

u

From mirror formula,

v

1

+

u

1

=

f

1

From above two equations,

−u

3

+

−u

1

=

20

1

u=−80 cm

So, the object is placed at a distance of 80cm in front of the mirror.

Answer 2

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