LOG 25 What happens when a prism is kept in the sunlight explain the whole process 23. Why is a rainbow called the demonstration of dispersion of white light in nature Uxplain 24 Mention the rules for drawing a ray diagram. Also mention the formation of image by spherical mirrors Write various applications of concave and convex mirrors. 26 How will you show the expansion of water on heating? 27. Write some applications of the expansion of liquid on heating 28. Write a note on thermal expansion. 29. Evaporation is a surface phenomenon. Justify the statement 30 Mention the effects of heating Write a short note on changing the pitch of different musical instruments. 32 Mention some characteristics of sound. 33. Why is a sound wave called a longitudinal wave? 34. What is sound? How does the speed of sound vary from medium to medium? 95. How are sound wave and light wave different from each other? 36. Mention some methods to conserve electricity at home and at school. 37. State the construction of a gold-leaf electroscope. 91 38. Write an experiment to differentiate between the conductors and insulators using a gold-leat electroscope 39. What is lightning? Mention some safety measures that one should follow during lightning 40. What is the law of electrostatic attraction and repulsion? do
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enjoys the spectacle of a rainbow glimmering against a dark stormy sky. How does sunlight falling on clear drops of rain get broken into the rainbow of colors we see? The same process causes white light to be broken into colors by a clear glass prism or a diamond. (See Figure 1.)
We see about six colors in a rainbow—red, orange, yellow, green, blue, and violet; sometimes indigo is listed, too. Those colors are associated with different wavelengths of light, as shown in Figure 2. When our eye receives pure-wavelength light, we tend to see only one of the six colors, depending on wavelength. The thousands of other hues we can sense in other situations are our eye’s response to various mixtures of wavelengths. White light, in particular, is a fairly uniform mixture of all visible wavelengths. Sunlight, considered to be white, actually appears to be a bit yellow because of its mixture of wavelengths, but it does contain all visible wavelengths. The sequence of colors in rainbows is the same sequence as the colors plotted versus wavelength in Figure 2. What this implies is that white light is spread out according to wavelength in a rainbow. Dispersion is defined as the spreading of white light into its full spectrum of wavelengths. More technically, dispersion occurs whenever there is a process that changes the direction of light in a manner that depends on wavelength. Dispersion, as a general phenomenon, can occur for any type of wave and always involves wavelength-dependent processes
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