flat diameter मीनिंग इन हिंदी

If the Pfund is intended to provide fully illuminated field coverage at a 90�Flat angle, then the minimum flat diameter must be at least \ sqrt 2 = 1.4142 times the paraboloid diameter.
The McDonald Observatory Supernova Search Telescope ( SNST ) used the Pfund configuration, and its feed flat diameter was 24 ", while the focusing mirror was an 18 " f / 4.5 paraboloid.