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JEE Advanced Ray Optics Important Questions

Last updated date: 09th Dec 2023
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MVSAT Dec 2023

JEE Advanced Important Questions of Ray Optics

JEE Advanced is one of the toughest exams for Engineering entrance in the country. Students have to focus more on Vedantu IIT JEE important questions for the exam preparation. They have to keep a regular check on what they are preparing and shouldn’t lose their hope. Students have to focus on major points without missing anything. Self-analysis makes a huge difference in the student’s mindset. Staying positive throughout the preparation and while giving the exam is the major key to success.


JEE Advanced Important Questions


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JEE Advanced

Chapter Name:

Ray Optics

Academic Session:



English Medium



Available Material:

Chapter-wise Important Questions with PDF

Master the Concepts of JEE Advanced Physics Ray Optics with Our Practice Papers

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Ray Optics Important Questions for JEE Advanced

In this chapter, you will come to know the Huygens principle clearly and derive the laws of reflection and refraction along with the phenomenon of interference which is based on the principle of superposition. Ray optics is the main topic that will deal with one of the most important principles in the area of ray optics. The corpuscular model predicted that if the ray of light is bent towards the normal then the speed of light will be greater in the second medium. 

Our subject matter experts at Vedantu have prepared these solutions for the important questions in a step by step manner to make students understand. With these important questions for JEE Advanced, they can have a quick revision before the examination and can remember the points which are to be written for the exam. This is one of the important units which has a weightage of around 11% to 12% and it is approximately 18 marks. Focusing more on this unit is really important for the students to score well.

Before we take a look at and try solving important questions around this topic, let’s take a quick journey of the important things to remember about this topic.

  • Huygens Principle, the statement, and the applications.

  • Refraction Index of Various media like Water (1.33), Rock Salt (1.54), Diamond(2.42)

  • Basic laws of reflection ( Angle of incidence = Angle of Reflection, Incident ray and Reflected ray lie on the opposite side of the normal etc)

  • The images formed by a plane mirror are always virtual and erect

  • Characteristics of an image formed by a plane mirror

  • Phenomenons like polarization, absorption, etc

  • Single slit and double-slit diffraction experiments along with their inferences.

FAQs on JEE Advanced Ray Optics Important Questions

1. According to Ray Optics, what is the difference between reflection, refraction and diffraction?

Given how similar these words are and combined with the fact that they are all used in the same chapter, it is not surprising that many students get confused in the terminology. To keep this simple, we’re mentioning below the definitions of all three and the examples you can keep in mind so as to not forget what they mean.

  • Reflection: Easiest of them all and you probably have studied this even in school days. It is basically the bouncing back of a ray of light when it is incident on a reflective surface like that of a mirror. Otherwise, it would have continued on its linear path. Example: What you see in the mirror is your “reflection” from a plane mirror.

  • Refraction: This is what students learn after completing their understanding of reflection. It is the change in the direction of light when it encounters a change in medium. A part of the incident ray gets reflected and another part gets refracted. Eg: The formation of a rainbow happens because of refraction.

  • Diffraction: Diffraction is what takes place when a travelling wave of light encounters either an obstacle or an opening. There are two types of diffraction which are Fresnel Diffraction; Fraunhofer Diffraction. Example: X-Ray diffraction.

2. What are the things learnt in the Ray Optics chapter when preparing for JEE Advanced?

This chapter started by discussing the basic laws of reflection and refraction and further went on to discuss crucial principles and concepts like:

  • Refractive index and its value for different mediums like water, glass and diamond.

  • Real and Apparent Depth (by taking examples of objects inside a lake as viewed by a bird and more)

  • Huygens Principle 

  • Reversibility of light

  • Total Internal Reflection

  • Refraction through a prism

  • Dispersion of light and how it takes place

  • Dispersion without deviation and deviation without dispersion

Students wanting to score good marks in the advanced in order to secure that position in a College of their choice must take this chapter really seriously and revise all the above-mentioned concepts on a regular basis as these are frequently asked in the JEE advanced.

3. According to the JEE Advanced chapter Ray Optics, why is the Huygens principle so important and how can students make sure they’ve learnt it well enough?

The Huygens principle, also known as the Huygens–Fresnel Principle it is a very important method that helps in the analysis of wave propagation both in near and far-field diffraction. It is crucial not only from the exam point of view but also in the latter part of the students' engineering years. Questions based on this principle are frequently asked in the exam, both in JEE Mains and JEE Advanced. It makes studying this particular topic of extra importance, and hence our subject experts have carefully put together this article that specifically deals with the Huygens principle and everything you need to know about it.

4. What are important points to cover while studying diffraction from the JEE Advanced chapter Ray Optics?

At least one question is almost guaranteed to appear in the exam that tests the students based on their understanding of diffraction. There are quite a few terms that one must be familiar with in order to be able to solve problems based on it. A good enough understanding of Phase Difference, Constructive and Destructive Interference, Compton effect, fringe width and temporal coherence is needed to land the correct answer in the exam. Put simply, Phase difference which is expressed in either degrees or radians is the amount by which a particular wave ‘leads’ or ‘lags’ another wave having the same frequency and starting from the same point. An even value of path difference gives rise to constructive interference while an odd one leads to destructive interference.

5. What does critical angle mean according to the JEE Advanced chapter Ray Optics?

We all know that when a ray of light moves from a denser medium to a rarer medium, it moves away from the normal. There is a special case in which the ray, after refraction, passes by making a 90° angle with the normal. The angle of incidence in such a case is known as the critical angle. Note that this phenomenon only takes place when travelling from a denser medium to a rarer medium and not the other way round. This is because of the simple fact that in the latter case, the ray of light bends towards the normal and hence the angle of refraction is always less than 90° and never equal to it. Students can get access to all the important questions and topics from the website of Vedantu. The student can visit the website and download the study materials in the PDF format for free from the app and website.