Suppose to obtain a diffraction pattern one student uses a violet-colored beam of light. If the student replaces violet light with green light then:

Concept:

Visible Light:

• ​The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view.
• It consists of fundamental colours: violet, blue, green, yellow, orange, red

Diffraction:

• It is defined as the bending of light around corners such that it spreads out and illuminates areas where a shadow is expected.
• The silver lining which we witness in the sky is caused due to diffraction of light. When the sunlight passes through or encounters the cloud, a silver lining is seen in the sky.
•  
• The fringe width of the diffraction pattern is given as, \(w=\frac{\lambda D}{d}\)

Explanation:

• The fringe width of the diffraction pattern is given as, \(w=\frac{\lambda D}{d}\)
• From the above expression, the fringe width is directly proportional to the wavelength of light.
• The wavelength of violet light is less than that of green light.
• So, when violet light is replaced by green light, the fringe width of the diffraction pattern becomes broader and further apart.

 Hence, the correct option is 3.