Question

optical system formed by the convex lenses has focal length of 15 cm and 12 cm then its effective focal length will be ?

Answer 1

Explanation:

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 .

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