Question

two thin lenses of focal lenghths 10cm each are separated by 5 cm. the focal length of the combination

Answer 1

Answer:

20/³

Explanation:

Answer 2

Answer:

2 0 / 3

Explanation:

Given : two thin lenses of focal lengths 1 0 cm each are separated by 5 cm.

To find :  the focal length of the combination

Solution :

1 / f = 1 / f 1 + 1 / f 2 - d / f 1 f 2

= 2 / 1 0 = 5 1 / 1 0 0

4 - 1 / 2 0 = 2 0 / 3

Thus ,

2 0 / 3 Is the correct answer of this question .

The focal length of a lens is the distance between the lens and the image sensor when the subject is in focus, and it is commonly expressed in millimetres (e.g., 28 mm, 50 mm, or 100 mm). In the case of zoom lenses, both the minimum and maximum focal lengths, such as 18-55 mm, are specified.

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