Wave Optics JEE Questions PDF with Solution, Practice Now

Wave Optics JEE Questions: Wave Optics is an important Physics topic taught in JEE Main and Advanced. The chapter in detail throws light on the wave nature of light. The topics interference, diffraction and polarization of light come under this chapter. As the name suggests, wave optics states the property of light waves, unlike ray optics, which states the rectilinear propagation.

9 to 10 wave optics-based questions are asked in JEE Main and the JEE Advanced questions based on wave optics are mostly on interference and diffraction. This means, students must practice adequately and prepare the concepts. The questions can be both numerical as well as conceptual. Though the weightage is small considering the number of questions, every mark matters in such a competitive exam. Practicing wave optics questions JEE Mains and JEE Advanced interference and diffraction questions can be a sure shot method to score well as the formulas are very simple and the theory is well defined.

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Wave Optics JEE Questions Overview

Wave Optics forms the basis of many concepts of modern physics. In this chapter, students learn about Young’s Double Slit Experiment, fringe width, path difference, Huygens’ principle, and diffraction at a single slit. All these topics are essential not only for JEE but also for higher studies of physics. 

In the JEE Main Exam pattern, wave optics is tested through JEE MCQs, numerical value-type questions, and in some cases, integer-type problems too. The questions of this topic are of moderate difficulty and are direct in JEE Main but JEE Advanced may have some tricky questions on interference and diffraction. Solving these important wave optics PYQs JEE will help students become familiar with the range of questions asked in the previous years and will equip them for the exams to come.

Practice Wave Optics JEE Questions

Let us now see some practice Wave Optics JEE Questions that follow the JEE exam pattern.

1. If a light polarised along y-axis of intensity I₀/2 is passed through two polaroids P₁ and P₂ as shown in figure. Then the intensity of light observed by an observer on other side of P₂ (if the polaroid P₁ is rotate clockwise) as a function of angle θ

2. A parallel beam of light of wavelength 5000 Å is incident on slit S. Another two slits S₁ and S₂ are illuminated at a distance 2 meter as shown in the figure. The minimum distance between S₁ and S₂ such that maximum intensity will occur at O is

A. √10 mm
B. 1 mm
C. 1/2 mm
D. √5 mm

3. The figure shows a Young’s double slit experiment with a source which emits un-polarised light. In addition, P is a polarizer with axis whose direction is not given, but it completely polarizes the light falling on S₂. Calculate the ratio of the intensities of the principal maximum to the first minimum i.e. Imax/Imin, when the polarizer is present.

A. 2
B. 4
C. 5
D. 8

4. In a YDSE experiment, the two slits are covered with a transparent membrane of negligible thickness which allows light to pass through it but does not allow water. A glass slab of thickness t = 0.41 mm and refractive index μ₀ = 1.5 is placed in front of one of the slits as shown in the figure. The separation between the slits is d = 0.30 mm. The entire space to the left of the slits is filled with water of refractive index μw = 4/3. A coherent light of intensity I and absolute wavelength λ = 5000 Å being incident on the slits making an angle 30° with horizontal. If screen is placed at a distance D = 1 m from the slits, the position of central maxima will be (approximately)

A. 0.6 cm above the central line of slits
B. 0.6 cm below the central line of slits
C. 1.6 cm above the central line of slits
D. 1.6 cm below the central line of slits

5. In the figure shown A, B and C are three slits each of which individually produces the same intensity I₀, at point P₀ when they are illuminated by parallel beam of light of wavelength λ. [Given BP₀ – AP₀ = λ/2, d ≪ D, I₀ = 4 W/m², λ = 6000 Å, Amplitude = 2 unit of each wave]. If slit B is closed the resultant amplitude at point P₀ is

A. 2√4 + √2
B. 2√2 + √2
C. √2 + √2
D. Zero

6. A plane wave front of light is incident on a plane mirror. Intensity is maximum at P when

A. cos θ = λ/2d
B. cos θ = 3λ/4d
C. sec θ − cos θ = 3λ/4d
D. sec θ − cos θ = λ/2d

7. Consider the superposition of waves coming from three light sources (slits) A, B and C as shown in fig. Given that BP₀ − AP₀ = λ/3 and d = √(2λD/3). The ratio of intensity at P₀ compared to intensity due to the individual slit is

A. 1.5
B. 2
C. 2.5
D. 3

8. A person lives in a high-rise building at a height 30 m on the bank of a river. Across the river is a well-lit tower of height 60 m. When person looks through a polarizer at an appropriate angle at light from top of tower reflecting from the river surface, he finds intensity of light is least. If refractive index of water is 4/3, width of river is:-

A. 120 m
B. 60 m
C. 80 m
D. 40 m

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Wave Optics JEE Questions PDF with Solution

PW has created the Wave Optics JEE Questions PDF with Solutions to practice for students. In this Wave Optics JEE Questions and Answers PDF are solved important wave optics PYQs JEE, direct formula-based questions, and conceptual JEE Advanced interference and diffraction questions. The solution to each question has been given step by step to help students learn not only the method but also the logic behind the answer.