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Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/1547
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dc.contributor.authorUdupa, D. V-
dc.contributor.authorShukla, R. P-
dc.contributor.authorSaksena, G. D-
dc.date.accessioned2007-05-09T05:46:39Z-
dc.date.available2007-05-09T05:46:39Z-
dc.date.issued1993-
dc.identifier.citationBASI, Vol. 21, pp. 527-530en
dc.identifier.urihttp://hdl.handle.net/2248/1547-
dc.description.abstractA large size concave mirror for use in the gamma-ray telescope TACTIC was tested. Focal length of the concave spherical mirror of diameter 600 mm was measured to be 401.2 cm using the Ronchi test. The surface accuracy of the mirror was estimated to be about Lambda/2 by visual observation of the fringes obtained. The spot size of the mirror for a nearly collimated beam was measured to be about 0.5 mm, whereas the computed size of the spot for a spherical mirror is about 0.1 mm. The reflectivity of the mirror was measured to be about 83% in the visible region.en
dc.format.extent245424 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherAstronomical Society of Indiaen
dc.subjectGamma rayen
dc.subjectOptical mirroren
dc.titleOptical testing of a gamma-ray telescope mirroren
dc.typeArticleen
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