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With the help of a telescope that has an objective of diameter 200 cm, it is proved that light of wavelengths of the order of 6400 coming from a star be easily resolved. Then the limit of resolution is

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Important Questions on Wave Optics

EASY
12th Uttar Pradesh Board
IMPORTANT
Resolving power of a telescope will be more, if the diameter a of the objective is
HARD
12th Uttar Pradesh Board
IMPORTANT
Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30 cm. The wavelength of light is 600nm. To see the stars just resolved by the telescope, the minimum distance between them should be 1 light year=9.46×1015m of the order of :
MEDIUM
12th Uttar Pradesh Board
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Phase contrast microscope was invented by:
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12th Uttar Pradesh Board
IMPORTANT
Assuming human pupil to have a radius of 0.25 cm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that human eye can resolve at 500 nm wavelength is
HARD
12th Uttar Pradesh Board
IMPORTANT
The semi vertical angle of cone of the rays incident on the objective of microscope is 20°. If the wavelength of incident light ray is 6600 A°. Calculate the smallest distance between two points which can be just resolved.
MEDIUM
12th Uttar Pradesh Board
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What is the minimum angular separation between two stars if telescope is used to observe them with an objective of circular aperture 20 cm? The wavelength of light used is 5900A°.
HARD
12th Uttar Pradesh Board
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What is Fresnel's distance? Obtain equation for Fresnel's distance.
HARD
12th Uttar Pradesh Board
IMPORTANT
What are resolution and resolving power?