Question

(vi) A diffraction pattern is obtained by making blue light
incident on a narrow slit. If blue light is replaced by red
light, then the diffraction bands
(a) disappear
(b) become broader
(c) become narrower (d) remain same​

Answer 1

Answer:

b is the correct option

Answer 2

The Diffraction bands become broader.

Explanation:

Given Data

A diffraction pattern is obtained by making blue light incident on a narrow slit.

Find - what happened to diffraction bands when blue light is replaced by red light.

• The wavelength (λ) of the light used in the experiments and width (W) of the fringe and diffraction are directly proportional.

                            Wavelength (λ) ∝ Width

                            Wavelength (λ) ∝ Diffraction

• Wavelength of red is larger than the wavelength of the blue
• Wavelength of red is between 700 and 635 nm.
• Wavelength of blue is between 490 and 450 nm.
• When the wavelength increases, automatically the size of the diffraction bands will become broader in size.

Therefore, the replacement from blue to red light in an experiment results in increase in wavelength and the diffraction bands will become broader in size when diffraction pattern is obtained on a narrow slit.

To Learn More ...

1) What is refraction? Why does a ray of light bends on refraction? Will red coloured light and blue colour light band equal or not? Give reasons.

https://brainly.in/question/7338258

2) Arrange the colours in increasing order of wavelength  

 https://brainly.in/question/3913604