IGNOU PHE 15 2014 - Explain Rayleigh's criterion for the limit ofresolution of a tel

Question

Explain Rayleigh's criterion for the limit of
resolution of a telescope. What are the factors
which determine the resolving power of a
telescope ? How does light gathering power of a
telescope affect its resolving power ? Obtain the
limit of resolution of a 2 m telescope (in arc-sec)
for the wavelength of 500 nm

26 Jun 2018

Answer :

Word Count : 292

Rayleigh's criterion defines the limit of resolution for telescopes, determining the minimum angular separation at which two point sources can be distinguished. According to Rayleigh, two point sources are just resolvable when the central maximum of one diffraction pattern coincides with the first minimum of the other's pattern.

The resolving power of a telescope depends on several factors. The primary one is the diameter of the telescope's objective lens or primary mirror. A larger diameter allows more light to enter the telescope,

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