SSC MCQ Question Ans REFRACTION OF LIGHT
A straight stick appears to be bent when it is obliquely immersed partly in water. If we look directly to the bottom of a jug full of transparent water its bottom seems to be raised up. Of course we observe these phenomena in our everyday life. These events results from a special property of light called refraction. A special event of refraction is total internal reflection. Mirage is formed in the desert, diamond looks bright and information signals are sent through optical fiber because of total internal reflection of light. Many of us use spectacles to remove the defects of eyes. The glass of the spectacle is a lens. We will discuss all these phenomena in this chapter.
Look at figure 9.1. here two media, air and glass are shown. Coming from air medium following the path AB, light ray incidents at point B of the separation surface PQ of two media. If the light ray goes straight it will follow the path BC′ but it changes its path and follows BC. This phenomenon of bending of ray of light is called refraction. Therefore, when the ray of light travels obliquely from one transparent medium to another, the bending of ray of light at the surface of separation of the two media is called the refraction of light.
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