Notice: Undefined offset: 2 in /var/www/dictionary/searchDisplayPaging.php on line 18
<< < ang rel > >>
relative refractive index dišan-e šekasti-ye bâzâni Fr.: indice de réfraction relatif The ratio of the sine of the angle of incidence to the sine of the angle of refraction for a ray passing out of one of the media into the other. → relative; → refractive; → index. |
Yerkes refractor šekastgar-e Yerkes Fr.: réfracteur de Yerkes The largest → refracting telescope and the last of the great refractors with a lens diameter of 102 cm (f/d = 19), completed in 1897. The lens was ground by American telescope builders Alvan Clark & Sons. Used mainly for both visual and photographic studies of double stars, it is typical of the long-tube refractors traditionally employed in such work. After Yerkes Observatory; → refractor. |
Notice: Undefined offset: 2 in /var/www/dictionary/searchDisplayPaging.php on line 18
<< < ang rel > >>