Question

A convex lens of focal length 15cm is placed in contact with a concave lens of focal length 6cm.Calculate effective focal length power of lens​

Answer 1

Answer:

Given,

f

1

=+10cm for convex lens

f

2

=−20cm for concave lens

The focal length of the combination is given by

f

1

=

f

2

1

+

f

2

1

f

1

=

+10cm

1

+

−20cm

1

=

20cm

1

f=+20cm

Explanation:

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