NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction Updated for 2024-25

NCERT Solutions for Class 10 Science Chapter 10 are available to download. Light Reflection and Refraction is organized in such a way that it covers a wide range of scientific topics that are relevant to our daily lives. Students have been taught basic science with no clear distinctions between areas such as physics, chemistry, and biology. NCERT is widely used and recommended in schools around the country. The following are some of the benefits of using NCERT Solutions:

• The challenging questions interspersed between chapters encourage students to think outside the box and apply what they’ve learned in the chapter.
• NCERT Solutions give you complete answers to chapter questions that will help you pass the CBSE Term I exams.

Class 10 Science ch light NCERT solution are widely used by students, particularly in Science and Mathematics. Here you will find NCERT Solutions for Class 10 Science Chapter 10 – Light Reflection and Refraction, which includes well-explained answers to all of the questions from the textbook. Get the whole NCERT Solutions for Chapter 10 Light Reflection and Refraction for free right here!

NCERT Solutions Class 10 Science Chapter 10 CBSE Free PDF Download

Download the Class 10 Science ch light NCERT solution in a free PDF format now and boost your understanding and performance in the subject. In this you will get light reflection and refraction class 10 questions and answers pdf which you can use offline.

LIGHT REFLECTION AND REFRACTION

Class 10 Light Reflection and Refraction Question Answer

Here are all the to class 10 Light Reflection and Refraction question answer improve your understanding:

Class 10 Science Ch Light EXERCISES Question Answers Page No. 168

1. Which one of the following materials cannot be used to make a lens?

(a) Water

(b) Glass

(c) Plastic

(d) Clay

Ans. (d) Clay

Reason: Clay is not a suitable material for making lenses due to its properties. Lenses are typically made from materials like glass, plastic, or even water, but clay lacks the necessary optical characteristics required for lens functionality.

2. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?

(a) Between the principal focus and the centre of curvature

(b) At the centre of curvature

(c) Beyond the centre of curvature

(d) Between the pole of the mirror and its principal focus.

Ans. (c) Beyond the centre of curvature

Reason: When the image formed by a concave mirror is virtual, erect, and larger than the object, the object must be positioned beyond the centre of curvature. This specific positioning results in the described characteristics of the image formed by the concave mirror.

3. Where should an object be placed in front of a convex lens to get a real image of the size of the object?

(a) At the principal focus of the lens

(b) At twice the focal length

(c) At infinity

(d) Between the optical centre of the lens and its principal focus.

Ans. (b) At twice the focal length

Reason: To obtain a real image of the size of the object with a convex lens, the object should be placed at twice the focal length of the lens. This positioning results in the formation of a real image that is the same size as the object.

4. A spherical mirror and a thin spherical lens have a focal length of -15 cm. The mirror and the lens are likely to be

(a) both concave

(b) both convex

(c) the mirror is concave, and the lens is convex

(d) the mirror is convex, but the lens is concave

Ans. (c) the mirror is concave, and the lens is convex

Reason: Given that the focal length is negative (-15 cm), the mirror is concave, and the lens is convex. This is because the sign convention for focal length distinguishes between concave (negative focal length) and convex (positive focal length) mirrors and lenses.

5. No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

(a) plane

(b) concave

(c) convex

(d) either plane or convex

Ans. (a) plane

Reason: If your image appears erect regardless of the distance from the mirror, the mirror is likely to be a plane mirror. Plane mirrors always produce virtual and erect images of objects.

6. Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

(a) A convex lens of focal length 50 cm

(b) A concave lens of focal length 50 cm

(c) A convex lens of focal length 5 cm

(d) A concave lens of focal length 5 cm

Ans. (c) A convex lens of focal length 5 cm

Reason: To read small letters found in a dictionary, a convex lens with a shorter focal length (5 cm) would be preferred. A shorter focal length lens provides greater magnification, making it easier to read small letters with clarity.

7. We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.

8. Name the type of mirror used in the following situations.

(a) Headlights of a car

(b) Side/rear-view mirror of a vehicle

(c) Solar furnace

Support your answer with a reason.

Ans.

(a) Headlights of a car – Concave mirror

Concave mirrors are used in the headlights of cars because they can focus the light from the bulb into a parallel beam, providing better illumination of the road ahead. The bulb is placed at the focus of the concave mirror.

(b) Side/rear-view mirror of a vehicle – Convex mirror

Convex mirrors are used as side/rear-view mirrors in vehicles. They provide a wider field of view, allowing the driver to see more of the traffic behind them. Convex mirrors form virtual, erect, and diminished images, which is desirable for rear-view mirrors.

(c) Solar furnace – Concave mirror

Concave mirrors are used in solar furnaces to concentrate the sun’s rays onto a small area, creating a high-temperature focal point. The parallel rays from the sun are reflected and focused by the concave mirror, heating up the solar furnace placed at the focus.

9. One-half of a convex lens is covered with black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations.

No, a convex lens with one-half covered by black paper will not produce a complete image of the object. This can be verified experimentally by placing such a lens in front of an object and observing the image formed on a screen.

When one-half of a convex lens is covered, only the uncovered portion of the lens can refract light and contribute to the formation of the image. The covered portion blocks the light rays passing through it, resulting in an incomplete or partial image.

Experimentally, you will observe that the image formed is cut off on one side, corresponding to the covered portion of the lens. The image will appear as a semicircle or a partial image of the object.

10. An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and nature of the image formed.

Ans.

Position of the image: 16.67 cm on the opposite side of the lens.

Size of the image: 3.33 cm (inverted).

Nature of the image: Real and inverted.

The lens formula is 1/f = 1/u – 1/v

• Object distance (u) = -25 cm (object distance is negative as per the sign convention)
• Focal length (f) = +10 cm (focal length is positive for a converging lens)
• Object height (h_o​) = 5 cm

Using the lens formula:

1/v = 1/f + 1/u

1/v = 1/10 + 1/-25

1/v = 3/50

v = 50/3

v = 16.67 cm

The positive value of v indicates that the image is formed on the opposite side of the lens.

Calculate the magnification (m):

m = h_i/h₀ = v/u

m = 16.67/-25

m = -0.67

The negative sign indicates that the image is inverted.

Determine the image height (h_i):

h_i = m × h₀

h_i = -0.67 × 5 = -3.33 cm

The negative sign indicates that the image is inverted.

11. A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

12. An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.

13. The magnification produced by a plane mirror is +1. What does this mean?

14. An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position, nature and size of the image.

15. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharply focused image can be obtained? Find the size and nature of the image.

16. Find the focal length of a lens of power -2.0 D. What type of lens is this?

17. A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

NCERT Exemplar Answers key for Class 10 Science Chapter 10 also are accessible.

Class 10 Science 10th Chapter CBSE Notes

Chapter 10 – Light Reflection and Refraction NCERT Solutions for Class 10 Science

10th Chapter One of the most essential chapters in Class 10 Science is Light Reflection and Refraction, which is worth 7 points according to the most recent grading scheme. Students will learn about light phenomena such as refraction and reflection in Chapter 10 of Class 10 Science. Spherical mirrors, image creation, and how to make ray diagrams will all be covered.

Important Topics Covered in Class 10 Science Chapter 10 Light: Reflection and Refraction

Understanding these concepts is crucial as they form the basis of many optical devices and natural phenomena. Here are the important topics covered in Class 10 Science Chapter 10:

Reflection of Light:

• Laws of reflection
• Types of mirrors (plane, concave, convex)
• Image formation by mirrors
• Sign convention for spherical mirrors
• Mirror formula and magnification

Refraction of Light:

• Laws of refraction
• Refractive index
• Refraction through a rectangular glass slab
• Total internal reflection
• Refraction by spherical lenses
• Image formation by lenses and their ray diagrams
• Sign convention for spherical lenses
• Lens formula and magnification
• Power of a lens

Optical Phenomena:

• Reflection and refraction of light in nature
• Optical instruments (e.g., microscope, telescope)
• Applications of mirrors and lenses in everyday life

Have you ever pondered what allows us to see things? The response to the question is simple. During the day, sunlight assists us in seeing items. Light reflects as it strikes an object. When this reflected ray reaches our eyes, it aids our vision. Light is responsible for many spectacular events, including the development of the rainbow, stars, and many others. Let us investigate the phenomena of refraction and reflection using straight-line light propagation in Class 10 Science Chapter 10 Light Reflection and Refraction. In this chapter, we’ll use the NCERT Solutions from INFINITY LEARN to try to comprehend how spherical mirrors reflect light.

Features of NCERT Solutions for Class 10 Science Chapter 10 Light: Reflection and Refraction

• Provides thorough answers to all of the chapter’s questions.
• The material presented is authentic and suitable, and the language used is clear and understandable to all.
• For CBSE exams, Olympiads, and other competitive exams, these solutions can be used.
• Concise responses are offered to assist pupils in better understanding.

FAQs on NCERT Solutions for Class 10 Science Chapter 10 Light

What topics are covered in NCERT Solutions for Class 10 Science Chapter 10?

The NCERT Solutions for Class 10 Science Chapter 10 cover topics like the laws of reflection and refraction, image formation by mirrors and lenses, refraction through a glass slab, and practical applications of these concepts in optical devices.

How can NCERT Solutions for Class 10 Science Chapter 10 help in exam preparation?

The NCERT Solutions provide detailed, step-by-step answers to all textbook questions, helping students understand complex concepts and practice problem-solving techniques, which are crucial for performing well in exams.

Where can I download the NCERT Solutions for Class 10 Science Chapter 10?

You can download the NCERT Solutions for Class 10 Science Chapter 10 from various educational websites and platforms that offer free PDF downloads, ensuring you have easy access to study materials anytime.

Are the NCERT Solutions for Chapter 10 useful for understanding image formation by lenses and mirrors?

Yes, the NCERT Solutions for Chapter 10 include comprehensive explanations and ray diagrams for image formation by both concave and convex lenses and mirrors, aiding in a clear understanding of these concepts.

Do the NCERT Solutions for Chapter 10 include numerical problems?

Yes, the NCERT Solutions for Chapter 10 include solved numerical problems related to reflection and refraction, mirror and lens formulas, and magnification, helping students practice and master these important calculations.