Ray Optics – 11

11. Two thin lens of Power +5 D and -2 D are put in contact with each other. Focal length of the combination is :

(a) + 3 m
(b) 0.33 m
(c) -3 m
(d) -0.33 m

Answer : (b)

Explanation : No answer description available for this question. Let us discuss.

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