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Rayleigh’s Criterion

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Maharashtra State Board: Class 11

Definition: Resolution (Rayleigh's Criterion)

The condition where the images of two point objects close to each other are regarded as resolved (separated), if the central maximum of one falls on the first minimum of the other, is called Rayleigh's criterion for resolution.

Maharashtra State Board: Class 11

Definition: Not Resolved (Unresolved)

When the separation between the central maxima of two objects is less than the distance between the central maximum and the first minimum of any of the two objects, the images are said to be 'not resolved' or unresolved.

Maharashtra State Board: Class 11

Definition: Just Resolved

When the separation between the central maxima of the two objects is just equal to the distance between the central maximum and first minimum of any of the two objects, the images are said to be just resolved.

Maharashtra State Board: Class 11

Definition: Well Resolved

When the separation between the central maxima of two objects is greater than the distance between the central maximum and first minimum of any of the two objects, the images are said to be well resolved.

Maharashtra State Board: Class 11

Law: Rayleigh's Criterion for Resolution

Statement: According to Lord Rayleigh, the images of two point objects close to each other are regarded as resolved (separated), if the central maximum of one falls on the first minimum of the other.

The reasoning of Rayleigh's criterion is given by considering the intensity distribution in the diffraction pattern produced by two objects.

Three Conditions:

Condition Description
Not Resolved Separation between central maxima < distance between central maximum and first minimum of either object
Just Resolved Separation between central maxima = distance between central maximum and first minimum of either object
Well Resolved Separation between central maxima > distance between central maximum and first minimum of either object
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