- cylindrical
**spherical**- planar
- bipolar

## To achieve the Fresnel class of diffraction, the wavefront required is

To achieve the Fresnel class of diffraction, the wavefront required is **spherical.**

## Types of diffraction

- Fraunhofer’s class of diffraction
- Fresnel class of diffraction

## Fraunhofer’s class of diffraction

In this type of diffraction, the light source is far away from the slits that’s why the wavefront is planar.

## Fresnel class of diffraction

In this type of diffraction, the light source is close to the slits that’s why the wavefront is spherical.

## Note

generally, we use Fraunhofer’s class of diffraction.

This question is about MSc Waves and Optics MCQs. This is the previous year’s question about the competitive exams.

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