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When a rectangular glass slab is placed on different coloured letters, the violet coloured letter appears to be raised more. What is the reason behind it? |
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Answer» Solution :In case of a glass slab, the APPARENT displacement of the letters placed beneath it is, `x = t(1 - (1)/(MU)) or, (t - x) = (t)/(mu)` where t = thickness ofthe slab and `mu` = refractive INDEX of the particular COLOUR of light. SINCE `mu_(v)` for violet colour is maximum, the value of (t - x) i.e. the distance of the letter from top of the slab will be minimum, thus the letters of violet colour will seen to be raised more than other colours. |
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