Question

Visible light passing through a circular hole forms a diffraction disc of radius 0.1 mm on a screen. If X-ray is passed through the same set up, the radius of the diffraction disc will be

• A. zero
• B. < 0.1 mm
• C. 0.1 mm
• D. > 0.1 mm

Answer 1

The correct option is B < 0.1 mm

$r\propto \lambda$
${\lambda }_{X-ray}<{\lambda }_{visiblelight}$
hence the radius of diffraction disc formed will be smaller.