If a is width of slit, then conditon for first minimum is **asinθ=λ.**

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## What is the condition for first minima in diffraction?

First order minima

Using the Huygens’ construction, we consider **a point at the very top of the slit, and another point a distance a/2 below it**, i.e. a point at the very top of the lower half of the slit. Consider parallel rays from both points, at angle θ to the axis of symmetry.

## What is the condition of first minima?

If a is width of slit, then conditon for first minimum is **asinθ=λ.**

## What is the condition for minima in Fraunhofer diffraction?

Minima of Intensity in Fraunhofer diffraction pattern from a single slit. but not for m = 0 , **only for m = 1, 2** … This is why when slit is very narrow a ≈ 0 , the first minima is far away and one has continous distribution of light. If slit is narrower than the wavelength, a < λ, no minima are observed.

## What is first order maxima?

The first bright image to either side occurs when **the difference in the pathlength of the light from adjacent slits of the grating is one wavelength**, and it is called the “first order” diffraction maximum. … If light of a longer wavelength is used, the maxima are at larger angles.

## Which one will be diffracted maximum?

The correct option is C **radio waves**. Explanation:Maximum diffraction occurs when size of obstacle is almost equal to wavelength of light wave. Hence maximum diffraction occurs for larger wavelength . As wavelength of radio wave is higher than others maximum diffraction will occur for it.

## What happens when you increase the distance between slits?

The spacings between different fringes decreases as the distance between the slits increases because it is dependent on L. **Increasing the wavelength of the light** increases the spacing between different fringes since the spacing between different fringes is wavelength dependent.

## What is the angle between the two first order diffraction minima?

The angle between the first and second minima is only **about 24º(45.0º − 20.7º)**. Thus the second maximum is only about half as wide as the central maximum.

## Why is there diffraction in single slit?

The single slit. When light passes through a single slit whose width w is **on the order of the wavelength of the light**, then we can observe a single slit diffraction pattern on a screen that is a distance L >> w away from the slit. … All these waves interfere to produce the diffraction pattern.

## What is maxima and minima in diffraction?

**A high point of a function is named maxima, and the low point of a function is minima**. Following is the condition for maxima in diffraction: Following is the condition form minima in diffraction: where λ is the wavelength of light used and a is slit width.

## What is the condition for maximum intensity?

Now, **the point at which amplitudes of two waves add up is** called maxima or the intensity is maximum and the point at which amplitudes of two waves cancel each other is called minima of the intensity is minimum.

## What is the difference between Fresnel and Fraunhofer diffraction?

The basic difference between fresnel and Fraunhofer diffraction is that in **Fresnel diffraction the source of light and screen is at a finite distance from the obstacle**, while in Fraunhofer diffraction if the source of light and screen is at an infinite distance from the obstacle.

## What is meant by Fraunhofer diffraction?

Fraunhofer diffraction is the **type of diffraction that occurs in the limit of small Fresnel number** . In Fraunhofer diffraction, the diffraction pattern is independent of the distance to the screen, depending only on the angles to the screen from the aperture.

## What is 1st order diffraction?

The **diffraction of a given narrow beam of light** (corresponding to a single wavelength) with the help of a grating will produce a bright beam straight ahead and a series of beams to either side at angles where the light waves from adjacent slits reinforce each other.

## How are maxima and minima formed?

Maxima and minima are produced **when the path difference between waves is a whole number of wavelengths or an odd number of half wavelengths respectively**. … Interference patterns with microwaves, radio waves, sound, light and electrons.

## What is 2nd order diffraction?

What is Second Order Diffraction? In fluorescence spectroscopy, **monochromators are used to select the excitation and emission wavelengths**. … It can be seen that for constant each wavelength of light will be diffracted at a different angle which allows the monochromator to isolate the desired wavelength.