Question

(c) Camera
(iv) The focal lengths of two lenses in contact to
each other are 20 cm and 50 cm respectively.
Their combined power is:
(a) + 7.0 D
(b) + 70 D
(c) + 3.0 D
(d) + 30 D​

Answer 1

Answer:

please answer my question

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Answer 2

Answer:

+70 D

Explanation:

. 10cm AGFOR Radius of curvature=20cm radi (A) On plane surface (B) at a distance 10cm from plane surface (C) at a distance 30cm from plane surface (D) at a ...