Question

two convex lenses of power 5D and 2D are placed in contact with a concave lens of power 1 D calculate the focal length of combination and state the nature of the combination of these lenses​

Answer 1

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Step-by-step explanation:

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Answer 2

Given :

Power of the two convex lens = 5D and 2D

Power of the concave lens = 1D

To find :

The focal length of the combination and the nature of the combination .

Solution :

The power of the combination = 5D + 2D - 1D

=>  The power of the combination = 6D

The focal length of the combination = 1/6 m

The combination acts as a convex lens of power 6D .

The focal length of the combination is 1/6 m and the nature of the combination is as a convex lens .