Question

Question:-

What is the focus distance of a combined lens made by combining a concave lens of 25 cm focus distance placed in contact with a convex lens of 20 cm focus distance? whether this combination is convergent lens or divergent?​

Answer 1

Answer:

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Answer 2

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 .