[" A convex lens of diameter "8.0" cn: k used to foc-is a "],[" parallel beam of light of wavelength "620nm" .If the light "],[" be focused at a distance of "20cm" lions the lens,what "],[" would be the radius of the central bright spot formed? "]

A convex lens of diameter 8.0 cm is used to focus a parallel beam of light of wavelength 620 nm. 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 ?

A convex lens of diameter 8.0 cm is used to focus a parallel beam of light of wavelength 620 nm. 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 ?

A convex lens of diameter 8.0 cm is used to focus a parallel beam of light of wavelength 620 nm. 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 ?

Parallel beam of light of wavelength 420 nm is focused on a screen at a distance of 50 cm from the lens. What would be the radius of the central bright spot formed? Diameter of the lens is 10 cm.

Light of wavelength 620 nm goes through a pinhole of diameter 0.1 mm. Screen is placed at a distance 5 m from the hole. What will be the radius of the central bright spot formed ?

Light of wavelength 560 nm goes through a pinhole of diameter 0.20 mm and falls on a wall at a distance of 2.00 m. What will be the radius of the central bright spot formed on the wall ?

Light of wavelength 560 nm goes through a pinhole of diameter 0.20 mm and falls on a wall at a distance of 2.00 m. What will be the radius of the central bright spot formed on the wall ?

Light of wavelength 560 nm goes through a pinhole of diameter 0.20 mm and falls on a wall at a distance of 2.00 m. What will be the radius of the central bright spot formed on the wall ?

A parallel beam of monochromatic light of wavelength 5900Å falls normally on a convex lens of diameter 10cm which focusses the light on a flat normal screen located at a distance of 20cm from the lens. What would be the radius of the central bright spot formed on the screen?