Question

Two lenses of power -3.5D and 1.0D are placed in contact.Find the total power of combination of lenses.Calculate the focal length of the combination

Answer 1

Answer:

[P1 = -3.5D

P2 = 1D

P1 +P2 = -3.5+1=-2.5

FOCALLENGT =1/D

1/-2.5=-0.4

Explanation:

Answer 2

Answer:

•Power of

combination= -2.5D

•Focal length of

combination= -1/2.5

Explanation:

As we all know that

If Power of two or more lenses is give then the formula is

P=P1+P2...

Here,P1=-3.5D&P2=1D

P= -3.5+1

Hence,[P= -2.5]

And also

P=1/f , so

F=1/P

Hence,[F=1/-2.5]

Hope it will help you

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