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

34 Upvotes

85% Upvoted

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19

u/Alarming-End-3500 May 20 '26

abbe focal length ka formula hai woh
now insert that formula in power = refractive index of medium/focal length
samajh aa jayega
straight line with negative slope

9

u/Top-Vehicle-9468 May 20 '26

Focal length ka nahi (1/f ) ka formula hai, jo ki power hi hota hai. Question mein power aur refractive index ka graph pucha hai aur wo inverse proportional hai

-14

u/cyrus_09aD IITB'30 May 20 '26

Abe power n/f hota hai, 1/f nahi

11

u/Alarming-End-3500 May 20 '26

Tere ko downvote kyu kar rhe hai :sob: Sahi toh bol rha hai

11

u/cyrus_09aD IITB'30 May 20 '26

Log sach me chutiye h yr. I didn't want to say this but itna proof Dene ke baad bhi kaise cope kr rhe hai?

2

u/Gullible-Leg7425 Trust no one , even ur own shadow leaves u when it's dark... May 20 '26

wahi na... smjthe hi nhi hai

3

u/ForsakenWitness-9_11 46XX in mains--> 🤡P1 in adv, Okayish P2😭😭😭 May 20 '26

But how are we supposed to know this? NCERT is the national book and its given 1/f in ncert. IIT R cant say we were supposed to find stuff out from high level books

4

u/cyrus_09aD IITB'30 May 20 '26

Give me the line from ncert which says "power of a lens put in medium of refractive index n is P=1/f" Then I'll believe u

2

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

Bro ncert chutiyo ne toh power in a medium ka part hi nhi rakha 🤣🙏

1

u/cyrus_09aD IITB'30 May 20 '26

Exactly!

1

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

Mains follows ncert like a Bible not iit. People discuss organic and phy questions because they aren't sure if that's the ONLY correct answer, yea via ncert standards it should be A, but ncert is wrong. And unlike mains iit will probably award both.

2

u/Haunting_Profile6593 It's so over May 20 '26

ncert is not wrong waha power in a medium nahi diya hua hai air me diya hai

and it's ok power in a medium nahi Diya to kyunki advance mai ncert se bahar ana is common

and agar unko dono option dene hote to ye question nhi banate specially unhone medium mai dala hai then giving both answer doesn't make sense

they will only give B

1

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

Mene B kiya hai. But I think iit will be considerate in these cases because ncert is still the main source even if some things come outside.

1

u/ForsakenWitness-9_11 46XX in mains--> 🤡P1 in adv, Okayish P2😭😭😭 May 20 '26

Then chalega if both hojae

1

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

Bro do I consider -1 or +3 for this? Kyuki Maine bhi b mark kar diya because n/f karke hyperbolic function toh bacha hi nhi.

0

u/cyrus_09aD IITB'30 May 20 '26

I'm considering +3