Question

Q18 Mohit picked up three convex lenses A, B and C of focal length 10 cm, 20 cm and 40 cm respectively from Physics laboratory. Which lens has highest converging power?
(a) Lens C
(b) Lens A
(c) Lens B
(d) Same converging power of all the three lenses 1.1. house​

Answer 1

Answer:

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

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