Question

a convex lens of focal length 8 cm and another convex lens of focal length 12 cm placed in contact with each other. what is the power and focal length of combination lenses​

Answer 1

Answer:

Focal length of convex lenses, f

1

=30cm

Focal length of concave lenses, f

2

=−20cm

⇒

f

1

=

f

1

1

+

f

2

1

f=−60cm. Therefore diverging lens .