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In single slit experiment, the width of the slit is reduced. Then, the linear width of the principal maxima….. 

In single slit experiment, the width of the slit is reduced. Then, the linear width of the principal maxima…..  Correct Answer increases but becomes less bright

CONCEPT:

  • Single Slit Experiment: The diffraction or bending phenomenon of light in which light from a coherent source interfere with itself and produce a distinctive pattern on the screen called the diffraction pattern.
    • In single slit diffraction, the light that passes through a single slit is on the order of the wavelength of the light.
    • The diffraction pattern on the screen will be at a distance D away from the slit.

The linear width of the principal maxima is found using the given formula:

β = λ (D/d)

where λ is the wavelength of light, D is the distance between the screen and slit and d is the width of the slit.

EXPLANATION:

The linear width of the principal maxima is found using the given formula:

β = λ (D/d)

So β α 1/d

So if the width of the slit is reduced, the width of the principal maxima will increase.

This implies that the central maximum becomes fainter when becomes wider than before because the energy of principal maxima will be same.

Thus the central maximum becomes less bright.

So the correct answer is option 1.

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