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Ray Optics And Optical Instruments

Question
CBSEENPH12047743
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The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 A is of the order of

  • 106 rad

  • 10-2 rad

  • 10-4 rad

  • 10-6 rad

Solution

D.

10-6 rad

Angular resolution describes the ability of any image forming device such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish small details of an object, thereby making it a major determinant of image resolution.Angular resolution = 1.22 λd                                = 1.22 × 5000 × 10-1010 × 10-2                                = 6.1 × 10-6Angular resolution = 10-6 rad

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