A convex lens of diameter 8.0 cm


A convex lens of diameter $8.0 \mathrm{~cm}$ is used to focus a parallel beam of light of wavelength $620 \mathrm{~nm}$. If the light be focused at a distance of $20 \mathrm{~cm}$ from the lens, what would be the radius of the central bright spot formed?


Leave a comment


Click here to get exam-ready with eSaral

For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.

Download Now