I was asked by someone which is correct परछाईं parchāīṁ or parchāi परछाई (i.e. shadow, reflection) ?
The standard spelling is परछाईं parchāīṁ which is related to Sanskrit praticchāyā प्रतिच्छाया (reflection, shadow).
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I think it is because of the "image" they produce of an object. Although the processes are different.
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