“2017年IAO理论高低年组第3题-镜和板”的版本间的差异
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（创建页面，内容为“{{需要解答}} 本题为高低年组共用。 ==英文题目== '''αβ-3. Mirror and plate.''' There is a system, consisting of a plane mirror (100% reflection) an…”） |
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'''αβ-3. Mirror and plate.''' There is a system, consisting of a plane mirror (100% reflection) and a plane glass plate that transmits K% Of the light and reflects the other (100-K%) (This characteristics is the same for the light coming from both the directions). The mirror and plate are parallel and | '''αβ-3. Mirror and plate.''' There is a system, consisting of a plane mirror (100% reflection) and a plane glass plate that transmits K% Of the light and reflects the other (100-K%) (This characteristics is the same for the light coming from both the directions). The mirror and plate are parallel and | ||
infinite on their right side. An observer is placed at the point O (marked by *) and sees a star | infinite on their right side. An observer is placed at the point O (marked by *) and sees a star | ||
| − | with a magnitude 2m within a cone around direction | + | with a magnitude 2m within a cone around direction «A». What magnitude(s) star(s) (if any) |
| − | would the observer see in a cone near direction | + | would the observer see in a cone near direction «B» that is symmetrical to «A»? Calculate |
numerical value for K=50% and K=5% for each such a star (if any visible) or explain why no | numerical value for K=50% and K=5% for each such a star (if any visible) or explain why no | ||
stars are visible. | stars are visible. | ||
[[文件:IAO2017αβ-3.jpg|缩略图|IAO2017Tαβ-3]] | [[文件:IAO2017αβ-3.jpg|缩略图|IAO2017Tαβ-3]] | ||
2019年8月16日 (五) 17:49的版本
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本题目目前没有解答。要不要你来试试！ |
本题为高低年组共用。
英文题目
αβ-3. Mirror and plate. There is a system, consisting of a plane mirror (100% reflection) and a plane glass plate that transmits K% Of the light and reflects the other (100-K%) (This characteristics is the same for the light coming from both the directions). The mirror and plate are parallel and infinite on their right side. An observer is placed at the point O (marked by *) and sees a star with a magnitude 2m within a cone around direction «A». What magnitude(s) star(s) (if any) would the observer see in a cone near direction «B» that is symmetrical to «A»? Calculate numerical value for K=50% and K=5% for each such a star (if any visible) or explain why no stars are visible.
