Light from a chromatic light source strikes a surface. Seventy percent of the light is reflected and 30% is absorbed. a. What percentage of the light incident on the surface is transmitted? b. What are the reflectance, absorptance, and transmittance values? c. In your opinion, is the surface receiving the light or dark in color? d. Is the surface translucent or opaque?

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.