Interactions between surfaces and light of bathroom
 
1.0 Introduction
 
Bathrooms are the place where a diversity of photometricphenomenon can take place. Thefluorescent lamp is the illuminant of the architectural space. Its luminosity can be adjusted to alter the brightness of the room. Roughly, the bathrooms can be divided into two parts in the basis of various functions. Washroom is usually decorated with mirrors for the sake of tidying people up. The shower cubicles and the washroom are on the compact side. A glass door is often used to partition off the two parts of the bathroom. Lying at the corner of the shower cubicles, the bathtub looks elegant and its color is dense while bright. 
 
2.0 Analysis of how light interacts with surfaces
 
In the bathrooms, there is no doubt that the mirrors are necessary decorations. Specular reflection occurs when people can see their image in the mirror. The light in the bathroom is like natural light which travels equally in all directions. When the specific angled lights reach the specular surface, reflection light comes into being. As a result, visual light reflects into the eyes of people. The capability of seeing objects is the consequence of the visual lightreaching the photoreceptor(Snyder, 1985). On such an occasion, the mirror is the stage where natural light can be transmitted at an appropriate angle in order to form clear image.As a matter of fact, the visual capability will increase with the promotion on the amount of the incident luminous flux. The amount of the reflected luminous flux is proportional to the incident luminous flux. While in a dark bathroom, it is not easy for people to see clearly by way of mirrors. Another optic process makes a contribution for the phenomenon. In fact, some of the incident light will pass through the mirror, making the illumination intensity which strikes the photoreceptor decreased. Based on the transparency of glass door, the view in the bath area can be different.Glass door is a special kind of door leaf. First of all, judging from the thickness, it is not enough to say it's a solid door. Practically, it is a special kind of door leaf. The characteristics of the glass door are decided by the characteristics of the glass itself. Using transparent toughened glass, door leaf is fully functional. While using frosted glass, it is partly pervious to light. When light strikes the non-opaque materials, the direction will be altered. The view in the back of the non-opaque materials is obscure. After people take a shower at the bathroom, the moisture will come into being on the surface of the glass door. At first, the door is transparent on condition that the material of the door is transparent toughened glass rather than frosted glass. Light will not change the direction. It is possible for light to reach every corner inside the glass door and reflect back directly to the eyes. Once blear moisture change the direction of the light. In other words, light cannot pass through the non-opaque materials. What people can observe is the non-opaque material itself, not the perspective view. Bathtub is one of the most important ornaments in the bathroom. The superior color depth, light absorption and enamel-like luster make the tubs elegant and extraordinary.Made up from acrylic or glass fiber in most design, the tubs in modern household bathroom are also decorated with ceramic as well as steel. To such materials, light tends to be absorbed by the surface rather than reflected or transmitted. This photometric characteristic ensures the object more visual to some extent. Owing to some excess reflection, objects can be too glaring to be watched. Metal and ceramic absorb part of the light. As a consequence, the color of the bathtubs is likely to be dense. Soap bubbles create another optic view. As a matter of fact, the soap bubbles are transparent. However, a band of colors can be observed on the surface of the soap bubbles. In fact, for soap bubbles, there exists tiny thickness between interphase membranes. As is well known, white light is composed of many wavelengths of light. These different wavelengths change directionslightly. Curving soap bubble makes the angles different.The white light can be broken into its individualwavelengths. When encountering a medium of higherdensity, optical path difference makes the light waves either cancel out or reinforce each other. The light beams merge together at the photoreceptor and create an interference pattern of light and dark regions (Hanssona et al, 2011).Dispersion restores the polychromatic light.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3.0References
 
Hanssona C. ,Shevtsovaa E. ,Janzenc H.D.&Kjærandsend J.(2011).Stable structural color patterns displayed on transparent insect wings.PANS, 108(2).
 
Snyder L.H.(1985). The Visual System: Capabilities and Limitations.Flat-Panel Displays and CRTs, 54-69