a monochromatic beam of light is incident through water 。small piece of glass is suspended inside water。 it is found that when the temperature of water is change the glass piece disappears for a certain temperature .
（i）why glass piece disappears.
（ii） why monochromatic light is used 。
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Since density of water usually decrease with temperature it is clear that the speed of light in water will normally increase as the temperature increases 10 refractive index normally decrease as the temperature increases for a liquid hence glass piece disappears .
Explanation:
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