Question

An object in placed perpendicular to the principal axis. Focus length 20cm. Object placed 30 cm

Answer 1

Answer:

From lens formula,

v

1

−

u

1

=

f

1

u = - 20 cm

Focal length = -30 cm

∴

v

1

=

−30

1

+

(−20)

1

⇒

v

1

=

600

−20−30

=

600

−50

=−

12

1

⇒v=−12 cm