# focal ratio meaning in Hindi

focal ratio sentence in Hindi### Examples

- The Chinese Future Giant Telescope has a primary
*focal ratio*of 1.2. - :It's not the absolute diameter that matters, but the
*focal ratio*or f-number. - It uses a concave
*focal ratios*, Dall-Kirkhams are seldom faster than f / 15. - The particular aberrations associated with the coma ) are also worsened with short
*focal ratios*. - Also, for fast
*focal ratios*, the curve obtained is not sufficiently exact and requires additional hand correction. - Early off-axis designs such as the astigmatism and long
*focal ratios*, which make them useless for research. - The " focal length " of the telescope objective is the diameter of the objective times the
*focal ratio*. - Many of these targets are small and require long focal lengths, which can push the
*focal ratio*far above 5. - The focal length of 12.1 m combines with the baffled aperture of 3.7 m to a
*focal ratio*of 3.26. - A secondary mirror is to produce an unobstructed field-of-view of 20 arcminutes in diameter with a
*focal ratio*of 15.

### Meaning

**noun.**

- the ratio of the focal length to the diameter of a (camera) lens system

synonyms：, ,