So, the d75 would have been 100 d25 would have been 100 and I should have got it you are saying imperfection would have been 0 for an ideal separation.
அதனால், d75 என்பது 100 d25, இது 100 ஆக இருந்தால், குறைபாடு 0 ஆக இருக்க வேண்டும்.