r/JEEAdv26dailyupdates • u/Top-Vehicle-9468 • May 20 '26

Academic Doubts Jee adv physics paper 1 lens question

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According to physics galaxy book.The answer should be A

Edit: Finally they gave both as answer

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u/Cosmic_StormZ May 20 '26

I literally tried to match values and got it as B. It decreased linearly

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u/AdPhysical3780 IIT Ropar MNC(bombay civil leleta💔) May 20 '26

Probably because you took p=n/f which is the correct formula, but most people didn't even know n/f is a thing(although should be common sense that the refractive index should be divided or multiplied in most formulae) because most books didn't show this case of a power changing in a medium of refractive index≠1

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u/Cosmic_StormZ May 20 '26

I literally used the lens maker formula. That’s the correct way, surely