是改变20度，打错了，这样对吗，...
是改变20度，打错了，这样对吗，
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如果你说的“是改变20度，打错了”，是指“反射光线与入射光线之间的夹角改变20度”，那就对了。因为法线是垂直镜面的，将平面镜旋转10度，那法线也跟着旋转10度，入射角会大10度（或小10度），反射角也会跟大10度（或小10度），那反射光线与入射光线之间的夹角改变20度也就是说，反射光线与入射光线之间的夹角改变度数是面镜旋转度数的2倍如：入射光线的方向不变，将平面镜旋转10度，反射光线与入射光线之间的夹角改变20度。　　入射光线的方向不变，将平面镜旋转20度，反射光线与入射光线之间的夹角改变40度。不明可追问已赞过已踩过你对这个回答的评价是？评论
收起不对.夹角改变20度.因为入射光线与反射光线和镜面的夹角一样,将镜面旋转10度,镜面与入射光线的夹角改变十度,与反射光线的夹角也改变十度，所以入射光线与反射光线的夹角改变20度20度
不是10度。收起
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展开全部为何光波在反射后会有180度的相位改变?(由光密界质去光疏界质) Light wave is electromagic wave. It poses of time varying electric and magic field ponents. When light wave incident onto a surfacethe electric filed ponent causes electrons of atoms in the reflecting surface to vibrate and absorb energy from the light wave. The vibrating eelctrons then re-emit the absorbed energy in the form of electromagic wave. This is the reflected light. When light is incident onto an optically dense mediumthe electrons are more reluctant to vibrate than when light incident onto an optically less dense mediumbecause of elecrons are more tightly held in the optically dense medium. As a resultthere is a phase difference beeen the vibration of the electrons and the incident light wave. Hencethe reflected light wave would experience a phase lag with the incident wave. This is observed as a phase difference of 180 degrees in the reflected wave. 声波在反射后又会不会有相位改变呢? The phenomenon of phase shift occurs when waves are reflected by the surface of a medium where the speed of the wave in it is lower than that in the incident medium. For lightan optically dense medium has speed of light lower than that in an optically less dense medium. Hencethere is a phase shift on reflection. Such phenomenon is true for any waves. That is to sayit applies to sound wavewave on a atretched string e 有的话是否由光疏界质去光密界质? The propagation of sound is not related to the optical densityof a medium. Sound and light are waves of o pletely different nature. Sound wave is a kind of mechanical waves. As said abovethe phase shift phenomenon applies to sound wave when it is reflected from a medium within which the speed of sound is lower than in the incident medium. Since the speed of sound depends on the density of the mediumhence there is a phase shift to the sound wave when it is reflected from hot air (lower densityhigher speed of sound) onto cold air (higher densitylower sound speed).thats right....when a pulse directly to the fixed pointthe pulse will have 180 degrees phase difference in reflection *** /user/makseyuen2#p/u/39/75bHcNPz2e0 *** /user/makseyuen2#p/u/39/75bHcNPz2e0 2010-02-28 21:38:32 补充： *** /user/makseyuen2#p/u/41/drWy5a5EB5Mp3004962this is a "dead end" reflection which introduces a phase shift of pi... it is essential for forming a standing wave in some cases....照你讲应该系折射(refraction)，而唔系反射(reflection)。
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