Physics · JEE

Refraction of light at plane and spherical surfaces, thin lens formula and lens maker formula Concepts for JEE

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Concept explainer

Refraction of light at plane and spherical surfaces, thin lens formula and lens maker formula is a core JEE Main Physics subtopic under Optics. Master the definitions, standard results, and typical MCQ patterns tested in JEE Main and Advanced.

Key points

Understand the definition and scope of Refraction of light at plane and spherical surfaces, thin lens formula and lens maker formula in the JEE syllabus
Memorise key formulas and standard results linked to Refraction of light at plane and spherical surfaces, thin lens formula and lens maker formula
Practise 20–40 syllabus-aligned MCQs with step-by-step solutions

JEE tips

Revise Refraction of light at plane and spherical surfaces, thin lens formula and lens maker formula with a one-page formula sheet before attempting mixed tests
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Students often rush Refraction of light at plane and spherical surfaces, thin lens formula and lens maker formula questions without checking units, sign conventions, or boundary conditions — always verify assumptions before calculating.

Syllabus context

Part of Optics in JEE Main Physics.

Free sample questions

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Q1PhysicsUnit 16: Optics

The distance between an electric lamp and a screen is

d=1

m. A convergent lens of focal length

\boldsymbol{f}=21 \mathrm{cm}

is placed between the lamp and the lens such that a sharp image of the lamp filaments is formed on the screen. This question has multiple correct options

Q2PhysicsUnit 16: Optics

A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under: Position of candle

=12.0 \mathrm{cm}

Position of convex lens

=\mathbf{5 0 . 0} \mathrm{cm}

Position of the screen

=88.0 \mathrm{cm}

What will be the nature of the image formed if he further shifts the candle towards the lens?

Q3PhysicsUnit 16: Optics

Astigmatism for a human eye can be removed by using an additional:

Q4PhysicsUnit 16: Optics

An object is placed at

40 \mathrm{cm}

from the optic centre of a convex lens on its principal axis. if the focal length of the lens is

24 \mathrm{cm}

, find how far from the lens the screen should be placed to obtain a well-defined image.

Q5PhysicsUnit 16: Optics

White light is incident normally on a glass slab. Inside the glass slab,

Q6PhysicsUnit 16: Optics

Three lenses in contact have a combined focal length of

12 \mathrm{cm}

. When the third lens is removed the combined focal length becomes

60 \mathrm{cm}

. The third lens is :

Q7PhysicsUnit 16: Optics

The term refraction of light is best described by:

Q8PhysicsUnit 16: Optics

A diverging meniscus lens of 1.5 refractive index has concave surface of radii 3 and 4 cm.The position of the image, if an object is placed

12 \mathrm{cm}

in front of the lens, is

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Frequently asked questions

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Focus on core ideas across Refraction of light at plane and spherical surfaces, thin lens formula and lens maker formula. JEE tests application, not just memorisation.