Optics JEE Main Questions 2025: Important Practice Questions with PYQs

Soham Mitra

Updated On: December 03, 2024 11:41 AM | JEE Main

Optics JEE Main Questions 2025 have been provided here. Candidates can access solved problems of Previous Year's Optics JEE Main questions from here along with the important questions. 

Optics JEE Main Questions 2025: Important Practice Questions with PYQs

Optics JEE Main Questions 2025: Important Practice Questions with PYQs - The JEE Main 2025 aspirants need to be aware of the JEE Main Optics questions since comprehending the behaviour of light, including reflection, refraction, and the interplay of lenses and mirrors are necessary for excelling in the JEE Main Physics paper. Candidates can find a minimum of 2 questions from the Optics chapter in the JEE Main 2025 Exam . Hence, it is necessary that candidates accustom themselves with the important practice questions of the Optics chapter for JEE Main 2025. Candidates are advised to take a look at this article for the JEE Main Optics questions along with their solutions.

Latest Update- According to the official schedule, JEE Mains 2025 will be held from January 22, 2025, to January 31, 2025.

Check Also: JEE Main Previous Year Question Paper

JEE Main 2025 Optics Important Questions

Candidates can check the practice questions for JEE Main Optics 2025 along with their solutions as provided in the table below.

Serial No.

Question

Solution

1.

The eye can be regarded as a single refracting surface. The radius of curvature of this surface is equal to that of the cornea (7.8 mm). This surface separates two media of refractive indices 1 and 1.34. Calculate the distance from the refracting surface at which a parallel beam of light will come to focus

(a) 4.0 cm

(b) 1 cm

(c) 3.1 cm

(d) 2 cm


(1.34/v) – (1/∞) = (1.34 – 1)/7.8

1.34/v = 0.34/7.8

v =(1.34 x 7.8)/0.34

v = 30.7 mm ≈ 3.1 cm

Answer: (c) 3.1 cm

2.

Which of the following statements is correct?

(a) In primary rainbow, observer sees red colour on the top and violet on the bottom

(b) In primary rainbow, observer sees violet colour the top and red on the bottom

(c) In primary rainbow, light wave suffers total internal reflection twice before coming out of

In primary rainbow, red colour is at top and violet is at bottom. Intensity of secondary rainbowis less in comparison to primary rainbow.

3.

A single slit of width b is illuminated by coherent monochromatic light of wavelength λ. If the second and fourth minima in the diffraction pattern at a distance 1 m from the slit are at 3 cm and 6 cm, respectively from the central maximum, what is the width of the central maximum? (i.e. the distance between the first minimum on either side of the central maximum)

(a) 6.0 cm

(b) 1.5 cm

(c) 4.5 cm

(d) 3.0 cm



For single slit diffraction, sin θ = nλ/b

Position of nth minima from central maxima = nλD/b

When n = 2, then x2 = 2λD/b = 0.03 …(1)

When n = 4, then x4 = 4λD/b = 0.06 …(2)

Eqn. (2) – Eqn. (1)

x4 – x2 = (4λD/b) – (2λD/b) = 0.03 or

then width of central maximum = 2λD/b = 2 × (0.03/2) = 0.03 m = 3 cm

Answer: (d) 3.0 cm

4.

A green light is incident from the water to the air-water interface at the critical angle (θ). Select the correct statement.

(a) The entire spectrum of visible light will come out of the water at various angles to the normal

(b) The entire spectrum of visible light will come out of the water at an angle of 90° to the normal

(c) The spectrum of visible light whose frequency is less than that of green light will come out to the air medium

(d) The spectrum of visible light whose frequency is more than that of green light will come out to the air medium

As, sin θ = 1/μ

Also, the refractive index (μ) of the medium depends on the wavelength of the light.μ is less for the greater wavelength (i.e. lesser frequency).

So, θ will be more for a lesser frequency of light. Hence, the spectrum of visible light whose frequency is less than that of green light will come out to the air medium.

Answer: (c) The spectrum of visible light whose frequency is less than that of green light will come out to the air medium

5.

Calculate the limit of resolution of a telescope objective having a diameter of 200 cm, if it has to detect light of wavelength 500 nm coming from a star.

(a) 610 × 10–9 radian

(b) 152.5 × 10–9 radian

(c) 457.5 × 10–9 radian

(d) 305 × 10–9 radian



The limit of resolution,

Δθ = 1.22λ/a = (1.22 x 500 x 10-9/200 x 10-2) = 3.05 × 10–7 radian

Δθ = 305 × 10–9 radian

Answer: (d) 305 × 10–9 radian

6.

A convergent doublet of separated lenses, corrected for spherical aberration, has a resultant focal length of 10 cm. The separation between the two lenses is 2 cm. The focal lengths of the component lenses are

(a) 18 cm, 20 cm

(b) 12 cm, 14 cm

(c) 16 cm, 18 cm

(d) 10 cm, 12 cm



Since the doublet is corrected for the spherical aberration, it satisfies the following condition

f1 – f2 = d = 2 cm

f1 = f2 + 2

Equivalent focal length = F

F = (f1f2)/(f1 + f2 -d) = 10 cm

Solving it, we get

f1 = 20 cm

f2 = 18 cm

Answer: (a) 18 cm, 20 cm

7.

The speed of light in the medium is

(a) maximum on the axis of the beam

(b) minimum on the axis of the beam

(c) the same everywhere in the beam

(d) directly proportional to the intensity I

Given μ = μ0 + μ2I

As μ = Speed of light in vacuum/Speed of light in the medium

μ =c/v

v = c/μ = c/(μ0 + μ2I)

As the intensity is maximum on the axis of the beam, therefore v is minimum on the axis of the beam

Answer: (b) minimum on the axis of the beam

8.

The value of the numerical aperture of the objective lens of a microscope is 1.25. If the light of wavelength 5000 Å is used, the minimum separation between two points, to be seen as distinct, will be

(a) 0.48 m

(b) 0.12 m

(c) 0.38 m

(d) 0.24 m


Numerical aperture of the objective lens of microscope = 0.61λ/d

Minimum separation between two points d to be seen clearly,

d = 0.61λ/Numerical aperture

d = (0.61 x 5000 x10-10)/1.25

d = 0.24 m

Answer: (d) 0.24 m

9.

You are asked to design a shaving mirror assuming that a person keeps it 10 cm from his face and views the magnified image of the face at the closest comfortable distance of 25 cm. The radius of curvature of the mirror would then be

(a) 30 cm

(b) 24 cm

(c) 60 cm

(d) –24 cm


(1/15) + (1/-10) = 1/f

f = -30 cm

R = 2f = 2(-30) = -60 cm

Answer: (c) 60 cm

10.

As the beam enters the medium, it will

(a) travel as a cylindrical beam

(b) diverge

(c) converge

(d) diverge near the axis and converge near the periphery

Answer: (c) converge

11.

An observer looks at a distant tree of height 10 m with a telescope of the magnifying power of 20. To the observer, the tree appears

(a)10 times taller

(b)10 times nearer

(c) 20 times taller

(d) 20 times nearer

The telescope resolves and brings the objects closer, which are far away from the telescope. Hence, for a telescope with magnifying power 20, the tree appears 20 times nearer.

Answer: (d) 20 times nearer

12.

In an interference experiment the ratio of amplitudes of coherent waves is

(a1/a2) = ⅓. The ratio of maximum and minimum intensities of fringes will be

(a) 4

(b) 9

(c) 2

(d) 18

(Imax/Imin) = (a1 + a2)2/(a1 – a2)2 = (1 + 3)2/(1 – 3)2 = 16/4 = 4

Answer: (a) 4

13.

A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness is placed in contact with the light source. To get the sharp image again, the screen is shifted by a distance d. Then d is

(a) 0.55 cm towards the lens

(b) 0

(c) 1.1 cm away from the lens

(d) 0.55 cm away from the lens

Case I: u = –10 cm, v = 10 cm, f =?

Using lens formula,

(1/f) = [(1/v) – (1/u)]

1/f = [(1/10) – (1/-10)]

f = 5 cm

Case II: Due to introduction of slab, shift in the source is = t[1 – (1/μ)] = 1.5[1 – (⅔)] = 0.5

Now, u = –9.5 cm, v = 10.55 cm d = 10.55 – 10 = 0.55 cm away from the lens.

Answer: (d) 0.55 cm away from the lens

14.

A concave mirror for face viewing has a focal length of 0.4 m. The distance at which you hold the mirror from your face in order to see your image upright with a magnification of 5 is

(a) 0.16 m

(b) 1.60 m

(c) 0.32 m

(d) 0.24 m

Given, f = –0.4 m, m = 5 = (-v/u) = (y/-x) ⇒ y = 5x

(1/f) = (1/v) + (1/u)

⇒ (1/-0.4) = (1/5x) + (1/-x) = 4/-5x

⇒ x = -0.32 m so u = 0.32 m

Answer: (c) 0.32 m

15.

The image formed by an objective of a compound microscope is

(a) virtual and diminished

(b) real and diminished

(c) real and enlarged

(d) virtual and enlarged

Answer: (c) The objective of a compound microscope forms a real and enlarged image.

16.

To determine the refractive index of a glass slab using a travelling microscope, the minimum number of readings required are

(a) Two

(b) Four

(c) Three

(d) Five

Answer: (c) Three

Related Reads:

Kinematics Weightage in JEE Mains 2025 Units and Dimensions Weightage in JEE Main 2025
Kinematics JEE Main Questions 2025 Laws of Motion Weightage in JEE Mains 2025
Laws of motion JEE Main Questions 2025 JEE Main Question Paper April 2024 with Answer Key Solutions
JEE Main 2025 Exam JEE Main Preparation Tips
JEE Main Exam Pattern Work Energy and Power JEE Main Questions 2025
Work Energy and Power Weightage in JEE Main 2025 Rotational Motion Weightage in JEE Main 2025
Rotational Motion JEE Main Questions 2025 Gravitation Weightage in JEE Main 2025
Gravitation JEE Main Questions 2025 Thermodynamics Weightage in JEE Mains 2025
Thermodynamics JEE Main Questions 2025 Kinetic Theory of Gases Weightage in JEE Main 2025
Kinetic Theory of Gases JEE Main Questions 2025 Oscillation Weightage in JEE Mains 2025
Oscillation JEE Main Questions 2025 Electrostatics Weightage in JEE Main 2025
Electrostatics JEE Main Questions 2025 Current Electricity Weightage in JEE Main 2025
Current Electricity JEE Main Questions 2025 Magnetic Effects of Current Weightage in JEE Main 2025
Magnetic Effects JEE Main Questions 2025 Electromagnetic Waves Weightage in JEE Main 2025
Electromagnetic Waves JEE Main Questions 2025 Optics Weightage in JEE Main 2025
Atoms and Nuclei JEE Main Questions 2025 Atoms and Nuclei Weightage in JEE Mains 2025
Structure of Atom Weightage in JEE Mains 2025 -

We hope this article has been helpful for the candidates to be aware of the Optics JEE Main questions along with their solutions. Stay tuned to Collegedekho for the latest updates on JEE Mains 2025.

Are you feeling lost and unsure about what career path to take after completing 12th standard?

Say goodbye to confusion and hello to a bright future!

news_cta
/articles/optics-jee-main-questions-with-pyqs/
View All Questions

Related Questions

What is the B.tech fee for Mechanical Engineering at LPU?

-testUpdated on December 02, 2024 05:04 PM
  • 26 Answers
paras, Student / Alumni

The fee for B,TECH. IN MECHANICAL ENGINEERING at LOVELY PROFESSIONAL UNIVERSITY (LPU)varies based on the scholorship you qualify for through LPUNEST or other criteria like board exam percentages. The approximate tuition fee ranges from 120000-150000 per semester without scholorship. However , students with high scores in LPUNEST, JEE MAIN , or class 12 exams can receive significant scholarships, reducing the cost substantially.

READ MORE...

What is the reputation of Lovely Professional University? Is it a worthwhile investment to attend this university and pay for education?

-NikitaUpdated on December 02, 2024 05:25 PM
  • 16 Answers
Anuj Mishra, Student / Alumni

LPU is one of the best university in india which is approved by UGC. the main reason behind it its academic brilliance and the reputation that beholds. lpu known for its placements rankings in different categories and infrastructure and faculties. and after getting placement you will understand yourself that you have choosen the best.

READ MORE...

Is it possible to change my course in LPU after getting admission?

-Raghav JainUpdated on December 02, 2024 05:15 PM
  • 22 Answers
paras, Student / Alumni

Yes , It is often possible to change your course after admission, but the process and feasibility depend on the policies of the specific university. Typically , universities allow course changes within a certain timeframe , usually at the start of the academic session, and the approval is subject to seat availability. , in the desired program , meeting its eligibility criteria, and sometimes obtaining faculty consent.

READ MORE...

Do you have a question? Ask us.

  • Typical response between 24-48 hours

  • Get personalized response

  • Free of Cost

  • Access to community

Recent Articles

Recent News

Subscribe to CollegeDekho News

By proceeding ahead you expressly agree to the CollegeDekho terms of use and privacy policy

Top 10 Engineering Colleges in India

View All
Top