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(c) Diffraction is the bending or spreading of waves that  encounter an object ( a barrier or an opening) in their path.

(d) In Fresnel class of diffraction, the source and/or screen are at a finite distance from the aperture.

CBSE Class 12 Physics Notes: Wave Optics – Diffaraction

(e) In Fraunhoffer class of diffraction, the source and screen are at infinite distance from the diffracting aperture. Fraunhoffer is a special case of Fresnel diffraction.

  •  Single Slit Fraunhoffer Diffraction

CBSE Class 12 Physics Notes: Wave Optics – Diffaraction

The concept of diffraction is also useful in deciding the resolving power of optical instruments.

CBSE Class 12 Physics Notes: Wave Optics – Diffaraction

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