objective aperture meaning in Hindi

Examples

1. The Hamburg 1m Reflector ( 39 in / 100 cm objective aperture ) was the world's fourth largest reflector when it began operations in 1911.
2. In traditional dark-field imaging ( in a parallel beam mode, not STEM ), an objective aperture is placed in the diffraction plane so as to only collect electrons scattering through that aperture, avoiding the main beam.