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.

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?

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 beam of light of wavelength 590 nm is focused by a converging lens of diameter 10.0 cm at a distance of 20 cm from it. find the diameter of the disc image formed.

A beam of light of wavelength 590 nm is focused by a converging lens of diameter 10.0 cm at a distance of 20 cm from it. find the diameter of the disc image formed.

A beam of light of wavelength 590 nm is focussed by a converging lens of diameter 10.0 cm at a distnce of 20 cm from it. find the diameter of he disc image formed.