Question

In order to obtain a magnification of -0.75 with a convex lens of focal length 8 cm, the object should be placed:​

Answer 1

Answer:

Fromlensformulaeweget

f

1

=

v

1

−

u

1

f

1

+

u

1

=

v

1

Nowobjectdistancefromopticcentre=−8cm

andfocallength=10cm

v

1

=

10

1

−

8

1

v=−40cm

Since−vesigntheimagewillforminfrontofthelensandwillvirtual,enlargeanderect.