Question

the ratio of power of two convex lens is 2:1 . when these are placed in contact then power of combination is 6d. choose the correct option-----
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Answer 1

Answer:

A and B

Explanation:

i hope this is useful for you

Answer 2

Answer:

both A and B are correct

Explanation:

6D = 100/6 f

focal length = 50/3 cm

let focal lengths be x , 2x

so,

as it is convex lens focal length will be positive.

1/x + 1/2x = 3/50

6x = 150

x = 25   POWER = 100/25 = 4D

2x = 50 POWER = 100/50 = 2D

Power of lenses are 2D and 4D