😳82% Students couldn’t solve this in JEE Advanced in 2024😭| ft. Nishant Jindal

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N Avasthi sir, MS Chouhan sir, VK Jaiswal sir, Pankaj Joshi sir (author of Black Book), Ninja sir, NKS sir have come online.
Glory of this team:

Produced AIR 1 in JEE 4 times.
Produced 100s of under 100 rankers.
Produced AIR 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 in JEE Advanced.
Founders of Vibrant Academy, Kota. Each teacher with 25+ years of experience.
Authors of most important books for IIT JEE for decades.
Can you imagine learning from the teachers who even best of the best students don't get to learn from. Join the batch NOW!

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Website: https://bharatskool.com/new-courses/5... 🎯 JEE Advanced Lens–Mirror Challenge ft. Nishant Jindal & Ninja Sir | 82% Students Skipped This Question!

This is one of the most underrated but powerful JEE Advanced 2024 Physics questions — 82% aspirants didn’t even attempt it. In this video, Nishant Jindal and Ninja Sir break it down step-by-step and show how to solve it using nothing more than pure NCERT concepts.

The question involves a double-lens arrangement: a plano-convex lens formed at the bottom of a beaker + a liquid lens above it + the bottom surface silvered to act as a mirror. The challenge is to find for which values of n (refractive index) and h (height) the final image forms exactly at the object itself.

Most students get stuck because there are five optical events (refraction + reflection + refraction + reflection + refraction). But Ninja Sir explains the smartest method:
• Combine both lenses into a single equivalent lens
• Use the lens maker formula efficiently
• Treat the plano surface as R = ∞, simplifying 1/R
• Apply the condition 1/f_equivalent = 1/h for retracing rays
• Check options quickly using the relation 1.6 – n = 9/h

Together, Nishant and Ninja Sir test each option, verify which values satisfy the equation, and finally conclude that options A and B are correct.

This challenge proves that even an intimidating JEE Advanced question becomes easy if you understand:
– Equivalent focal length
– Reversibility of light
– Plano-convex lens behaviour
– N1 – N2 / R simplification
– Basic NCERT formulas

No exotic tricks. No high-level physics.
Just clear logic + NCRT + lens maker formula.

If you’re preparing for JEE Advanced 2025 or 2026, this is the exact thinking process you must develop.

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