Ray Optics and Optical Instruments Class 12 Case Study Questions Physics Chapter 9

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Last Updated on December 26, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 12 physics. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 12 physics. In this article, you will find case study questions for cbse class 12 physics chapter 9 Ray Optics and Optical Instruments.

Chapter	Ray Optics and Optical Instruments
Type of Questions	Case Study Questions
Nature of Questions	Competency Based Questions
Board	CBSE
Class	12
Subject	Physics
Unit	Unit 6 Optics
Useful for	Class 12 Studying Students
Answers provided	Yes
Difficulty level	Mentioned
Important Link	Class 12 Physics Chapterwise Case Study

Case Study Questions on Ray Optics and Optical Instruments

Questions

Question 1:

Refraction of light is the change in the path of light as it passes obliquely from one transparent medium to another medium. According to law of refraction $\frac{\sin i}{\sin r}={ }_1 \mu_2$, where ${ }_1 \mu_2$ is called refractive index of second medium with respect to first medium. From refraction at a convex spherical surface, we have $\frac{\mu_2}{v}-\frac{\mu_1}{u}=\frac{\mu_2-\mu_1}{R}$.
Similarly, from refraction at a concave spherical surface when object lies in the rarer medium, we have $\frac{\mu_2}{v}-\frac{\mu_1}{u}=\frac{\mu_2-\mu_1}{R}$ and when object lies in the denser medium, we have $\frac{\mu_1}{v}-\frac{\mu_2}{u}=\frac{\mu_1-\mu_2}{R}$.

Read the given passage carefully and give the answer of the following questions:

Q. 1. Refractive index of a medium depends upon which factors?

Q. 2. A ray of light of frequency 5 × 10¹⁴ Hz is passed through a liquid. The wavelength of light measured inside the liquid is found to be 450×10^–9 m. What is the refractive index of the liquid?

Q. 3. A ray of light is incident at an angle of 60° on one face of a rectangular glass slab of refractive index 1.5. What will be the angle of refraction?

Q. 4. When light is refracted into a rarer medium, what will be change in its wavelength and frequency?

Answers

1. Refractive index of a medium depends upon nature and temperature of the medium and wavelength of light.

2. Given, $v=5 \times 10^{14} \mathrm{~Hz} ; \quad \lambda=450 \times 10^{-9} \mathrm{~m}$,

$$
c=3 \times 10^8 \mathrm{~ms}^{-1}
$$

Refractive index of the liquid,

$$
\mu=\frac{c}{v}=\frac{c}{v \lambda}=\frac{3 \times 10^8}{5 \times 10^{14} \times 450 \times 10^{-9}}=1.33
$$

3. Given,

$$
i=60^{\circ}, \mu=1.5
$$

By Snell’s law,

$$
\begin{aligned}
\mu & =\frac{\sin i}{\sin r} \\
\sin r & =\frac{\sin i}{\mu}=\frac{\sin 60^{\circ}}{1.5}=\frac{0.866}{1.5} \\
\sin r & =0.5773 \text { or } r=\sin ^{-1}(0.58)
\end{aligned}
$$

4. Its wavelength increases but frequency remains unchanged.

Also check

Case study questions for other chapters of class 12 physics is given below.

• Semiconductor Electronics Class 12 Case Study Questions Physics Chapter 14
• Nuclei Class 12 Case Study Questions Physics Chapter 13
• Atoms Class 12 Case Study Questions Physics Chapter 12
• Dual Nature of Radiation and Matter Class 12 Case Study Questions Physics Chapter 11
• Wave Optics Class 12 Case Study Questions Physics Chapter 10
• Ray Optics and Optical Instruments Class 12 Case Study Questions Physics Chapter 9
• Electromagnetic Waves Class 12 Case Study Questions Physics Chapter 8
• Alternating Current Class 12 Case Study Questions Physics Chapter 7
• Electromagnetic Induction Class 12 Case Study Questions Physics Chapter 6
• Magnetism and Matter Class 12 Case Study Questions Physics Chapter 5
• Moving Charges and Magnetism Class 12 Case Study Questions Physics Chapter 4
• Current Electricity Class 12 Case Study Questions Physics Chapter 3
• Electrostatic Potential and Capacitance Class 12 Case Study Questions Physics Chapter 2
• Electric Charges and Fields Class 12 Case Study Questions Physics Chapter 1
• Case Study Questions for Class 12 Physics

We hope the given case study questions for Ray Optics and Optical Instruments Class 12 helps you in your learning.

Download eBooks for CBSE Class 12 Physics (Exam Special)

• 120 Case Study Questions for Class 12 Physics
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• MCQ Questions for Class 12 Physics
• Chapter Test for Class 12 Physics with Solutions
• 230 Important Numerical for Class 12 Physics
• 75 Important Diagrams & Graphs for Class 12 Physics

Topics from which case study questions may be asked

• Reflection of Light
• Spherical Mirrors
• Mirror Formula
• Refraction of Light
• Total Internal Reflection and Optical Fibers
• Refraction at Spherical Surfaces
• Lenses
• Thin Lens Formula
• Lens Maker’s Formula
• Magnification
• Power of a Lens
• Combination of Thin Lenses in Contact
• Refraction of Light through a Prism
• Optical Instruments
  • Microscopes
  • Astronomical Telescopes (Reflecting and Refracting)
  • Magnifying Powers of Optical Instruments

When a lens is placed in a liquid, where refractive index is more than that of the material of lens, then the nature of the lens changes.

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