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NCERT Solutions for Class 10 Science Chapter 9 – Light – Reflection and Refraction
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Chapter 9 – Light – Reflection and Refraction
Intext Questions with Solutions of Class 10 Science Chapter 9 – Light – Reflection and Refraction
1.
Ans: Light rays parallel to the principal axis converge at a location on the principal axis following reflection from the concave mirror.
The convergence point along the principal axis of a concave mirror is referred to as the principal focus of the concave mirror.
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3.
Ans: Concave mirror.
4.
Ans: In cars and other vehicles, a convex mirror is the ideal rearview mirror because it provides a larger field of view, allowing the driver to see most of the traffic behind him. Convex mirrors always create an erect, virtual, and diminished image of the item placed in front of them.
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6.
Ans: The magnifying effect of a spherical mirror:
As a result, the negative sign shows that, at a distance of 30 cm, an inverted picture forms in front of the specified concave mirror.
7.
Ans: When a light ray transitions from a rarer media to a denser medium, it refracts towards the normal line.
The light ray refracts towards the normal as it transitions from a rarer media (air) to a denser medium (water).
8.
Ans: Refractive index of a medium (nm) = Speed of light in vacuum/Speed of light in the medium
Speed of light in vacuum (c) = 3 × 108 m/s
Refractive index of glass (ng) = 1.50
Speed of light in the glass (v) = Speed of light in vacuum/ Refractive index of glass
= c/ng
=3 × 108/1.50 = 2x 108 ms-1.
9.
Ans: According to table 9.3, diamond has the largest optical density since it has the highest refractive index (= 2.42).
Air has the lowest optical density because it has the lowest refractive index (1.0003).
10.
Ans: Kerosene has n = 1.44.
n = 1.47 for turpentine
n = 1.33 for water
Light moves more quickly through water than through kerosene and turpentine oil because it has the lowest refractive index.
11.
Ans: Since a diamond has a refractive index of 2.42, light traveling through it will travel at a speed that is 2.42 slower than it would in the atmosphere.
Stated differently, light travels 1/2.42 times faster in a diamond than it does in a vacuum.
12.
Ans: The dioptre is the SI unit of lens power, represented by the letter D. One dioptre is defined as the optical power of a lens with a focal length of one metre.
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Exercise Questions with Solutions of Class 10 Science Chapter 9 – Light – Reflection and Refraction
1.
Ans: (d) Clay
2.
Ans: (d) Between the pole of the mirror and its principal focus.
3.
Ans: (b) At twice the focal length.
4.
Ans: (a) Both concave
5.
Ans: (d) Either plane or convex.
6.
Ans: (c) A convex lens of focal length 5 cm.
7.
Ans: When an object is positioned between the concave mirror’s focus F and pole P, or between 0 and 15 cm from the mirror, it produces an erect picture. The resulting image will be larger than the actual thing, upright, and imaginary.
8.
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- Concave Mirror: When positioned at their principal focus, concave mirrors can generate a strong parallel beam of light.
- Due to its widest field of view, the Convex Mirror is the best option.
- Concave Mirror: Due to its ability to concentrate the sun’s parallel beams at a primary point.
9.
Ans: A convex lens produces a complete image of an item, even when one half is obscured by black paper. This can be elucidated by examining the following two scenarios.
Scenario I: When the superior portion of the lens is obscured
A ray of light originating from the item will be refracted by the inferior portion of the lens. The rays converge on the other side of the lens to create the image of the specified object, as illustrated in the subsequent figure.
Scenario II: When the inferior part of the lens is obscured . A ray of light originating from the item is refracted by the upper portion of the lens. The rays converge on the other side of the lens to create the image of the specified object, as illustrated in the accompanying figure.
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Magnification is defined as,
Given that m = +1, it follows that h’ = h and v = -u.
- The value of m = 1 signifies that the size of the image is identical to that of the object.
- The positive sign of m indicates the formation of an erect image.
- The differing signs of ν and u signify that the image is located on the opposite side of the mirror relative to the object’s position, indicating that the image is formed behind the mirror and is therefore virtual.
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Related Study Resources of Chapter 9 – Light – Reflection and Refraction
Students can use the links below to get extra study materials for Class 10 Science Chapter 9: Light – Reflection and Refraction.
| Sl No. | Related Links |
|---|---|
| 1 | Class 10 Science Chapter 9 Light – Reflection and Refraction – Important Questions |
| 2 | Class 10 Science Chapter 9 NCERT Textbook |
Download Light – Reflection and Refraction NCERT Solutions PDF
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Class 10 Science Chapter 9 Overview
Class 10 Science has some of the most conceptually dense chapters, including Light: Reflection and Refraction. It shows kids how light acts when it hits surfaces or goes through different materials. Our Light – Reflection and Refraction NCERT Solutions help students comprehend how light rays behave, mirror and lens formulas, and real-world examples including how the human eye and optical instruments work.
It is frequently difficult for students to apply mathematics such as the mirror and lens equations, remember sign standards, or appropriately create ray diagrams. In order to assist with this, our answers come with step-by-step methods for fixing issues, clearly marked pictures, and quick ways to find the best answer for each question. So, even problems with numbers are much easier to solve.
The chapter is now more focused on real-world applications according to the 2025 NCERT curriculum update. It now has more real-world examples, like how light bends when it goes through eyeglasses, cameras, and telescopes. At the same time, extra theory has been cut down so that students may focus on understanding the concepts. Our Light: Reflection and Refraction NCERT Solutions follow this new format, which makes studying for tests easier and less stressful.
In the end, these methods assist students not only get better grades, but also learn how light affects their daily lives. Students get better at drawing ray diagrams, solving math problems, and explaining optical phenomena in clear, straightforward language by using our Light – Reflection and Refraction NCERT Solutions on a regular basis.
FAQs – Class 10 Science Chapter 9
This is a common issue! Our solutions provide a quick guide and examples for each mirror and lens case to help you memorize them easily.
By practicing regularly with our stepwise problems, you’ll naturally learn when to apply each formula correctly.
Follow our guided diagrams that use clear labeling and standard notation—perfect for full marks in exams.
Yes! Examples like mirrors, lenses, and eyeglasses help you connect textbook theory with real-world uses.
Our solutions include shortcuts, formula charts, and solved examples to help you solve faster and more accurately.