Question

94. A mineral 'X' is invisible in Canada Balsam.
The refractive index of 'X' is? ​

Answer 1

Answer:

    Due to its high optical quality and the similarity of its refractive index to that of crown glass (n = 1.55), purified and filtered Canada balsam was traditionally used in optics as an invisible-when-dry glue for glass, such as lens elements .

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