Question

1) The power of a lens is + 2.0 D. Its focal length should be
(a) 100 cm (b) 50 cm (c) 25 cm (d) 40 cm
0 O
А A

B

С


D​

Answer 1

Answer:

The power of a lens is + 2.0 D. Its focal length should be

B) 50 cm

Explanation:

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Answer 2

Answer:

(b) 50 cm

Explanation:

The power of a lens is defined as the reciprocal of its focal length in meters

P = 1/f (in m)

2 = 1/f

f = 1/2 m = 0.5m = 50cm

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