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Two lenses of power –15D and +5D are in contact with each other.

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+1 vote
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asked Mar 26, 2018 in Physics by paayal (26,720 points) ● 4 ● 6 ● 11

Two lenses of power –15D and +5D are in contact with each other. The focal length of the combination is

(a) + 10cm 

(b) –20cm

(c) –10cm 

(d) + 20cm

1 Answer

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answered Mar 26, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7
selected Mar 26, 2018 by Vikash Kumar
 
Best answer

(c) Power of combination = P1 + P2
= – 15D + 5D = – 10D.

Focal length of combination F = 1/P = 1/-10D

= -0.1m = -10cm

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