If the power of the lens is 5D then what

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Target Exam

CUET

Subject

Physics

Chapter

Ray Optics

Question:

If the power of the lens is 5D then what is its focal length?

Options:

10cm

15cm

20cm

25cm

Correct Answer:

20cm

Explanation:

Find its focal length. As we know, the power of the lens is the reciprocal of its focal length. Hence, the focal length is 20 cm.