Question

A convergent lens of power 5D is combined with a divergent lens of power -4D. Then, find the focal length and power of combination of both lenses​

Answer 1

Answer:

Explanation:  If you place these two lenses very close together, then their powers add - in this case to -12 dioptre. Then divide 1000 mm by -12 to get the focal length of 83.3 mm. ... A convergent lens of power 8 b is completed with a divergent lens of power minus ... Concave lenses have negative power) so the final focal length is 1/12 m ...

A convex lens has a focal length of 0.5m. It has to be ...  

What will be the focal length if the power of a convex lens is ...

What is the focal length of the convex lens of 1 D and ...

Answer 2

The focal length and power of combination of both lenses​ is 100 cm and 1 D.

Explanation:

Given that,

Power of a convergent lens, P = 5 D

Power of a divergent lens, P' = -4 D

We need to find the focal length and power of combination of both lenses​. We know that the power of the combination is given by :

$P_c=P+P'\\\\P_c=5\ D+(-4\ D)\\\\P_c=1\ D$

The focal length of the combination is given by :

$f=\dfrac{1}{P_c}\\\\f=\dfrac{1}{1}\\\\f=1\ m\\\\f=100\ cm$

So, the focal length and power of combination of both lenses​ is 100 cm and 1 D. Hence, this is the required solution.

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Combination of lenses

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