Question

calculate the focal length of a magnifying glass where magnifying power is 50 the final image is formed at 25 cm from the eye.​

Answer 1

Answer:

ANSWER IS 6

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Answer 2

Given: A magnifying glass has magnifying power 50 and the final image is formed at 25 cm from the eye.​

To find: The focal length of a magnifying glass.

Solution:

• The magnifying power of a magnifying glass is given by the formula,

        $M = 1 + \frac{D}{f}$

• Here, M is the magnification of the glass, D is the least distance of distinct vision and f is the focal length of the glass.
• On replacing the terms with the values given in the question,

        $50 = 1 + \frac{25}{f}$

• On rearranging and solving further, the value of f is found to be,

        $f = \frac{25}{49}$

           $= 0.51$

Therefore, the focal length of a magnifying glass is 0.51 cm.