Physics · Wave Optics

जब प्रकाश के एक बिंदु स्रोत को उत्तल लेंस के मुख्य फोकस पर रखा जाता है, तो बाहर निकलने वाले प्रकाश के तरंगाग्र (wavefront) का आकार कैसा होता है?

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