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第一问:为什么白天从竹帘外看不见室内的物体? 答:人眼之所以能看见物体,是由于光源发出的光,或者物体反射的光进入人的眼睛.白天,室内不开灯,室内比室外要暗.室外的自然光照射到竹帘的表面,有一大部分入射光被竹帘反射并进入人眼,使人看到竹帘.还有一小部分穿过竹帘的缝隙进入室内,照射到物体上,这些物体再将入射光反射到竹帘的内表面,内表面又将大部分光反射回室内,由竹帘缝隙射向室外的光线就更少了.对于室外的观察者来说,竹帘外表面反射到眼睛里的光线比室内物体反射到眼睛的光线要多得多.所以从竹帘外看不清或看不见室内的物体.
The first question is: Why can’t you see indoor objects from outside the bamboo curtain during the day? A: The human eye can see objects because the light from the light source, or the light reflected by the object, enters people’s eyes. During the day, the room does not turn on the lights. The interior of the room is darker than the outside. The outdoor natural light strikes the surface of the bamboo curtain. A large part of the incident light is reflected by the bamboo curtain and enters the human eye, allowing the person to see the bamboo curtain. A small part enters the room through the slit of the bamboo curtain. When they reach the object, these objects reflect the incident light to the inner surface of the bamboo curtain. The inner surface reflects most of the light back into the room. The light emitted by the bamboo curtain slit is even less. For outdoor observers It is said that the light reflected from the outer surface of the bamboo screen in the eyes is much larger than the light reflected from the objects in the room. Therefore, the objects in the room cannot be seen or seen from outside the curtain.