Question

इंटरनेट की सहायता से कुछ महान लोगों के पत्र प्राप्त कीजिए कुछ पत्र पढ़िए और उनसे प्राप्त शिक्षा को लिखिए
pls answer correctly
and if you write it on a paper and attach a image then I'll make you as brainlyist
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Answer 1

Explanation:

diffraction work ? and what is the relation between the size of the obstacle to the wavelength of the wave?