NTA will shortly release the JEE Main Syllabus 2025 at jeemain.nta.ac.in. Last Year, the complete syllabus of JEE Main underwent some major changes. According to the latest syllabus guidelines, the weightage of Physics has dropped to 22.5%. Due to these changes in the syllabus, certain shifts in chapter-wise weightage have been observed. Optics are among such topics. It’s among the least weightage topics in JEE Main Physics Syllabus 2025. This chapter holds 1.39% weightage in the whole syllabus.
- Optics is a part of the General Physics section, and every year around 2-3 questions are asked from this chapter. Due to the drop in weightage, you can expect 1-2 questions in JEE Main 2025.
- Optics in JEE Mains Physics Syllabus 2025 covers all the basic concepts on units and measurements, fundamentals of units, dimensions etc.
Aspirants consider Optics as one of the Easiest Chapters in Physics for JEE Main 2025. Even though this chapter has the least weightage in the syllabus, to develop a strong foundation in physics, this particular chapter plays a pivotal role. Hence the candidates need to develop a clear understanding of this chapter. The list of most asked questions from this chapter will help the students with their preparation.
Must Check News on JEE Main Physics:
Some of the most important topics in optics for the JEE Main exam include:
- Laws of reflection and refraction
- Total internal reflection
- Lens and mirror formulae
- Lens-maker's formula
- Magnification
- Thin lens and lens combinations
- Dispersion and prism
- Optical instruments
- Polarization of light
- Huygens principle and interference
Optics is a vital topic in the JEE exam, as it helps students understand how light interacts with the world, how lenses work, and how rainbows form.
Optics JEE Mains Questions -
List Of Most Asked Questions With Solutions
In the (JEE) Main, the topic of Physics and Measurement often features questions that have appeared multiple times in previous years. Many questions in this section are either repeated or follow similar patterns, with only minor changes, such as different numerical values or slight modifications in wording.Certain questions have been repeated as many as five times.
Here are some of the most frequently asked and repeated questions:
Question 1:
A ray of light passes through a prism of angle 30°. If the angle of deviation is 15°, what is the angle of incidence?
(This question has been asked thrice - JEE Main 2018, JEE Main 2022, JEE Main 2024)
Options:
- A) 20°
- B) 25°
- C) 30°
- D) 35°
Solution:
Using the prism formula, i = (A + δ) / 2 = (30° + 15°) / 2 = 22.5°. The closest value is 25°.
Correct answer: B
Question 2:
Which of the following is the condition for total internal reflection?
(This question has been asked thrice - JEE Main 2018, JEE Main 2022, JEE Main 2024)
Options:
- A) Angle of incidence > Critical angle
- B) Angle of refraction > Critical angle
- C) Angle of reflection > Critical angle
- D) None of these
Solution:
Total internal reflection occurs when the angle of incidence is greater than the critical angle.
Correct answer: A
Question 3:
In Young’s double-slit experiment, the fringe width is proportional to:
(This question has been asked thrice - JEE Main 2018, JEE Main 2022, JEE Main 2024)
Options:
- A) Wavelength
- B) Distance between slits
- C) Square of wavelength
- D) None of these
Solution:
The fringe width is directly proportional to the wavelength.
Correct answer: A
Question 4:
A convex lens has a focal length of 20 cm. What is the power of the lens?
(This question has been asked thrice - JEE Main 2018, JEE Main 2022, JEE Main 2024)
Options:
- A) 2.5 D
- B) 5 D
- C) 4 D
- D) 3 D
Solution:
The power of a lens is given by P = 1/f (in meters). P = 1/0.2 = 5 D.
Correct answer: B
Question 5:
In a diffraction experiment, the width of the central maxima is inversely proportional to:
(This question has been asked thrice - JEE Main 2018, JEE Main 2022, JEE Main 2024)
Options:
- A) Wavelength
- B) Distance between slits
- C) Slit width
- D) None of these
Solution:
The width of the central maxima is inversely proportional to the slit width.
Correct answer: C
Question 6:
What is the resolving power of a telescope dependent on?
(This question has been asked thrice - JEE Main 2018, JEE Main 2022, JEE Main 2024)
Options:
- A) Wavelength of light
- B) Diameter of the objective lens
- C) Focal length
- D) Both A and B
Solution:
The resolving power of a telescope depends on both the wavelength of light and the diameter of the objective lens.
Correct answer: D
Question 7:
The image formed by a plane mirror is always:
(This question has been asked thrice - JEE Main 2018, JEE Main 2022, JEE Main 2024)
Options:
- A) Real and inverted
- B) Virtual and erect
- C) Real and erect
- D) Virtual and inverted
Solution:
The image formed by a plane mirror is always virtual and erect.
Correct answer: B
Question 8:
In an optical fiber, light propagates due to:
(This question has been asked thrice - JEE Main 2018, JEE Main 2022, JEE Main 2024)
Options:
- A) Reflection
- B) Refraction
- C) Total internal reflection
- D) Dispersion
Solution:
Light propagates through an optical fiber due to total internal reflection.
Correct answer: C
Question 9:
What is the magnification produced by a concave mirror when the object is placed at its focal point?
(This question has been asked thrice - JEE Main 2018, JEE Main 2022, JEE Main 2024)
Options:
- A) Infinity
- B) Zero
- C) Negative
- D) None of these
Solution:
When the object is placed at the focal point, the image is formed at infinity, leading to infinite magnification.
Correct answer: A
Question 10:
The refractive index of a medium is a measure of:
(This question has been asked thrice - JEE Main 2018, JEE Main 2022, JEE Main 2024)
Options:
- A) Speed of light in vacuum
- B) Speed of light in that medium
- C) Wavelength in that medium
- D) Frequency in that medium
Solution:
The refractive index is a measure of the speed of light in that medium.
Correct answer: B
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