Lakhmir Singh Solutions for Class 10 Physics Chapter 5 Refraction of Light
By Ankit Gupta
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Updated on 2 May 2025, 16:05 IST
Physics is all around us—from the way light travels through a glass of water to how a pencil appears bent when dipped into it. One of the most interesting topics in Class 10 Physics is Refraction of Light, which helps us understand such everyday phenomena. Chapter 5 of the Lakhmir Singh Physics textbook explains this concept in a simple and clear manner, using real-life examples, activities, and diagrams. For students who want to strengthen their understanding of this topic, the Lakhmir Singh Solutions for Chapter 5 provide the perfect support system.
These solutions are designed to help Class 10 students grasp the basics of refraction. The chapter begins by explaining what refraction is—the bending of light as it passes from one medium to another, like from air into water or from glass into air. It then covers important terms such as the angle of incidence, angle of refraction, refractive index, and laws of refraction. All these terms may sound tough at first, but the Lakhmir Singh Solutions explain them step-by-step in easy language so that every student can follow along without getting confused.
One of the best things about these solutions is that they break down each question and answer in a way that is both exam-friendly and concept-based. Whether the question is short answer, long answer, or numerical, the solutions show how to approach it in a simple, logical manner. This not only helps in scoring better in board exams but also builds confidence in solving Physics problems.
The chapter also includes real-world applications of refraction such as lenses, optical fibers, and mirages. These examples are covered in the exercises, and the solutions guide students in understanding how refraction plays a role in each case. Diagrams are used wherever necessary to give visual clarity to the concepts.
In short, Lakhmir Singh Solutions for Chapter 5: Refraction of Light are an excellent resource for students who want to study smartly and do well in their Class 10 board exams. By using these solutions regularly, students can improve their problem-solving skills, gain a deeper understanding of light behavior, and become more confident in Physics as a subject. Whether you’re revising or practicing for the first time, these solutions are your go-to guide for mastering refraction.
Download Lakhmir Singh Solutions for Class 10 Physics Chapter 5 Refraction of Light PDF Here
Lakhmir Singh Class 10 Chapter 5 PDF includes detailed solutions, examples, and extra questions to help you master real numbers and other topics. Click here to download the Lakhmir Singh Class 10 Chapter 5 PDF.
Access Answers to Lakhmir Singh Solutions for Class 10 Physics Chapter 5 Refraction of Light
Q1. What do we call the ratio of the sine of the angle of incidence to the sine of the angle of refraction?
Answer: This ratio is called the refractive index.
Q2. What is the relation between the angle of incidence and the angle of refraction?
Answer: The refractive index is the ratio of the sine of the angle of incidence to the sine of the angle of refraction.
Q3. What is the unit of refractive index?
Answer: Refractive index has no unit.
Q4. Which has a greater refractive index: water or glass?
Answer: Glass has a higher refractive index than water.
Q5. The refractive index of carbon disulphide is 1.63 and that of ethyl alcohol is 1.36. Which one is optically denser?
Answer: Carbon disulphide is optically denser than ethyl alcohol.
Q6. What does it mean when the refractive index of diamond is 2.24?
Answer: It means that light travels 2.24 times faster in air than in diamond.
Q7. If the refractive index from air to diamond is 2.24, what is the refractive index from diamond to air?
Answer: The refractive index from diamond to air is 1 divided by 2.24, which is approximately 0.41.
Do Check: Lakhmir Singh Solutions for Class 10
Q8. How is refractive index related to the speed of light?
Answer: Refractive index = speed of light in vacuum / speed of light in the material.
Q9. Fill in the blank: When light moves from air into a transparent material, the bending of light depends on the ……… of the material.
Answer: Refractive index.
Q10. A light ray moving from glass to air bends in which direction?
Answer: The ray bends away from the normal.
Q11. A ray of light entering water from air at an angle will bend in which direction and why?
Answer: The ray bends towards the normal because water is optically denser than air.
Q12. A ray of light moves from water into air. In which direction does it bend?
Answer: It bends away from the normal.
Q13. What are two effects of refraction of light?
Answer: a) Objects underwater appear raised.
b) Pool water looks shallower than it actually is.
Q14. What is the name of the phenomenon that makes a swimming pool appear less deep?
Answer: Refraction of light.
Q15. When light enters glass from air, is the angle of refraction more or less than the angle of incidence?
Answer: The angle of refraction is less than the angle of incidence.
Q16. When light passes from air into glass, does it bend towards or away from the normal?
Answer: It bends towards the normal.
Q17. When light passes from water to glass, does it bend towards or away from the normal?
Answer: It bends towards the normal.
Q18. In which material does light travel faster: air or glass?
Answer: Light travels faster in air than in glass.
Q19. What makes water appear shallower than it is?
Answer: Refraction of light.
Q20. True or False: Refraction happens because light slows down in denser materials.
Answer: True.
Q21. Why does light bend when it moves from one medium to another?
Answer: Light bends because its speed changes as it moves from one material to another.
Q22. Fill in the blanks: a) Light travelling along the normal is ………
b) Light bends when passing from water to air. This is called ………
Answer: a) Not refracted
b) Refracted
FAQs on Lakhmir Singh Solutions for Class 10 Physics Chapter 5 Refraction of Light
What is covered in Lakhmir Singh Solutions for Class 10 Physics Chapter 5?
The solutions cover all textbook questions from Chapter 5 – Refraction of Light. This includes definitions, laws of refraction, numerical problems, ray diagrams, and conceptual questions about how light bends when it travels between different media.
Are the solutions based on the latest CBSE syllabus for Class 10?
Yes, the solutions are prepared according to the latest CBSE syllabus and guidelines. They are aligned with board exam patterns and help students prepare efficiently for the Physics portion of the Science paper.
Do the solutions explain numerical problems step by step?
Absolutely! Each numerical question is solved in a step-by-step format, showing how to apply formulas such as the refractive index and Snell’s Law. This makes it easier for students to understand the logic behind each step.
How do these solutions help in exam preparation?
The solutions offer clear, concise, and accurate answers to all exercise questions. They help students revise key concepts, improve accuracy in solving numericals, and gain confidence in writing precise theoretical answers during exams.
Are diagrams included in the solutions for better understanding?
Yes. Wherever needed, ray diagrams and labeled illustrations are included to help students visualize how light refracts through different media, such as glass or water.
Can these solutions be used for last-minute revision?
Yes, they are perfect for quick revision before exams. Since the answers are easy to follow and organized by question type, students can revise important topics and formulas quickly and effectively.
Where can I access these solutions for free?
Many educational websites and platforms, including Infinity Learn and others, offer free access to Lakhmir Singh Solutions in PDF format or through online study portals. You can download or view them for instant help while studying.