Question

a one centimetre object is placed perpendicular to the principal axis of a convex mirror of focal length 7.5 CM then the object should be placed in front of the mirror at a distance to get the size of the image as 0.6 is
a) 3 centimetres
b) 5 centimetres
c) 7.5 centimetres
d) 10 centimetres​

Answer 1

Answer:

The magnification is given as,

m=−

u

v

0.6=−

u

v

The mirror formula is given as,

v

1

+

u

1

=

f

1

0.6u

1

−

u

1

=

f

1

u=5cm

Thus, the distance from the mirror is 5cm