A convex lens of diameter 8 cm is used to focus to parallel beam of li – InterviewSolution

1.	A convex lens of diameter 8 cm is used to focus to parallel beam of light of wavelength 6200 ˙A. If the light be focused at a distance of 20 cm from the lens. What would be the radius of the central bright spot formed?
Answer» A convex lens of diameter $8 cm$ is used to focus to parallel beam of light of wavelength $6200 ˙ A$ . If the light be focused at a distance of $20 cm$ from the lens. What would be the radius of the central bright spot formed?

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