Ray Optics and Optical Instruments for NEET: PYQ trend, NCERT lines NEET repeats, free lecture

Ray Optics and Optical Instruments in NEET: the numbers

160NEET / AIPMT questions in our PYQ bank (1988–2026)

36exam years with a question from this chapter

7NCERT lines NEET asked more than once

Topics NEET asks most

Topic	Questions
Lenses and lens maker's formula	53
Refraction and total internal reflection	40
Prism and dispersion	33
Optical instruments	20
Reflection and spherical mirrors	14

NCERT lines NEET asked again and again

Read these lines from your NCERT book twice: NEET has built questions on each of them more than once.

When i = c the refracted ray just grazes the boundary, so angle of refraction is 90° , and sin c = 1/n for a medium to air.

NEET 2019NEET 2019NEET 2020NEET 2023

For thin lenses in contact, powers add : P = P₁ + P₂. Equal convex and concave lenses cancel to give zero power .

AIPMT 2006AIPMT 2006AIPMT 2008NEET 2023

At minimum deviation the ray goes through symmetrically, so r₁ = r₂ = A/2 and n = sin (A + Dₘ)/2 / sin A/2.

AIPMT 1999AIPMT 2010AIPMT 2015NEET 2016

A lens dipped in a liquid of the same refractive index stops bending light, so its focal length becomes infinite and it acts like a plain glass sheet.

AIPMT 2003AIPMT 2003AIPMT 2012

To see your whole image in a plane mirror you only need a mirror half your height , wherever you stand, because the image distance grows with your distance.

AIPMT 2000AIPMT 2000

Light stays inside an optical fibre because of repeated total internal reflection at the core-cladding wall, with the core having the higher index.

AIPMT 2001AIPMT 2001

A telescope objective needs a large focal length for high m = fₒ/fₑ and a large aperture for more light and better resolution.

NEET 2018NEET 2021

Free lecture by Prashant Sir

RAY OPTICS | NEET Physics Crash Course | All Concepts, Tricks & PYQs · 34,524 views on YouTube

Free NCERT notes for Ray Optics and Optical Instruments

The ray model of light: mirrors, refraction and TIR, lenses, prisms, and microscopes and telescopes. It is one of the most-asked Class 12 chapters in NEET, mostly through sign-convention numericals, so practise signs until they are automatic.

Read the chapter notes: key NCERT points, graphs, every formula with its meaning, tricks, common mistakes and NEET traps.

FAQ

How many questions come from Ray Optics and Optical Instruments in NEET?

Our bank of NEET and AIPMT papers (1988–2026) has 160 questions from Ray Optics and Optical Instruments, most of them from Lenses and lens maker's formula, Refraction and total internal reflection, Prism and dispersion.

Which NCERT line of Ray Optics and Optical Instruments has NEET asked the most?

This line has been asked 4 times in NEET/AIPMT: "When i = c the refracted ray just grazes the boundary, so angle of refraction is 90°, and sin c = 1/n for a medium to air."

Where can I study Ray Optics and Optical Instruments for NEET for free?

Prashant Sir's full lecture is free on the NEET Physics Kota YouTube channel, and the chapter notes are free on Dhruv.