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NCERT Solutions for Class 8 Science Chapter 16 Light
Edited By Vishal kumar | Updated on Sep 16, 2023 09:10 AM IST
NCERT Solutions for Class 8 Science Chapter 16 – Access and Download Free PDF
NCERT Solutions for Class 8 Science Chapter 16 Light are an essential part of the Class 8 NCERT curriculum. With these NCERT Solutions, achieving good marks in exams becomes an attainable reality. Let's consider a scenario: you're admiring your reflection in the mirror, but suddenly, the lights go out. In complete darkness, can you see your own face? The answer is no. This simple example highlights the crucial role of light in our ability to see.
This Story also Contains
- NCERT Solutions for Class 8 Science Chapter 16 – Access and Download Free PDF
- NCERT Solutions for Class 8 Science Chapter 16 Light
- NCERT Solutions for Class 8 Science Chapter 16 Light: Solved Exercise Questions
- NCERT Solutions For Class 8 Science- Chapter-Wise
- Light Class 8 Science Chapter 16-Topics
- Key Features of Light Class 8 Questions and Answers
CBSE NCERT solutions for Class 8 Science Chapter 16, "Light," not only help you assess your understanding of the chapter but also delve into the fascinating world of how light enables vision. Whether it's emitted or reflected by an object, light is the fundamental requirement for visualization. In this NCERT Class 8 Science chapter 16 Light , you'll explore the laws of reflection, which explain how light interacts with surfaces to allow us to see objects. The NCERT Science Chapter 16 solutions provide clear explanations for questions based on these reflection laws.
For a Class 8 student, CBSE NCERT solutions for Class 8 Science Chapter 16 Light serve as a valuable tool for completing homework assignments and performing well in exams. By understanding the principles of light and reflection presented in this chapter, you'll not only excel in your studies but also gain a deeper appreciation for the role of light in our daily lives.
**As per the CBSE Syllabus for the academic year 2023-24, this chapter has undergone a renumbering and is now designated as Chapter 12.
Free download class 8 science chapter 16 question answer PDF for CBSE exam
NCERT Solutions for Class 8 Science Chapter 16 Light
NCERT Solutions for Class 8 Science Chapter 16 Light: Solved Exercise Questions
Answer:
No, we cannot see the objects inside the room but we might see the objects outside the room. An object is visible to us when light reaches it, gets reflected and reaches our eyes. Inside the darkroom there is no light present to be reflected from the objects and reach our eyes and therefore we won't be able to see them but if there is light present outside the room and if it is reflected from objects outside the room and if this light reaches our eyes then we would be able to see the objects outside the room.
Answer:
In regular reflection, the reflected rays are parallel to each other whereas in diffused reflection the reflected rays are not parallel to each other. In diffused reflection, the laws of reflection are not violated. In the case of diffused reflection, the surface from which reflection takes place has microscopical irregularities which means the surfaces at the points where each ray gets reflected from are not parallel to each other.
(a) Polished wooden table
Answer:
Regular reflection since the polished wooden table has a smooth surface.
Chalk powder
Answer:
Diffused reflection since chalk powder has an irregular or rough surface.
Cardboard surface
Answer:
Diffused reflection since cardboard surface is rough.
Marble floor with water spread over it
Answer:
Regular reflection since marble with water spread over it is a smooth surface.
(e) Mirror
Answer:
Regular reflection since mirror is a smooth surface.
Piece of paper
Answer:
Diffused reflection since a piece of paper is an irregular surface.
Q4. State the laws of reflection.
Answer:
The laws of reflection are:
(i) The angle of reflection is always equal to the angle of incidence.
(ii) The incident ray, the reflected ray and the normal at the point of incidence to the surface on which reflection takes place all lie in the same plane.
Answer:
Place a plane mirror on the table. Take a piece of paper and make a small hole in it. Ensure that the light in the room is dim. Hold the sheet normal to the table. Take another piece of paper and place it on the table in contact with the mirror. Draw a normal from the mirror on the paper kept on the table Now, light a torch on the mirror through the small hole such that the ray of light falls on the normal at the bottom of the mirror. When the ray from this hole is incident on the mirror, it gets reflected in a certain direction. You can easily observe the incident ray, reflected ray and the normal to the mirror at the point of incidence on the sheet placed on the table. This shows that the incident ray, the reflected ray, and the normal to the surface at the point of incidence all lie in the same plane.
Q6. Fill in the blanks in the following.
Answer:
(a) A person 1 m in front of a plane mirror seems to be 2 m away from his image.
(b) If you touch your left ear with the right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with the left hand .
(c) The size of the pupil becomes large when you see in dim light.
(d) Night birds have fewer cones than rods in their eyes.
Choose the correct option in Question 7
Q7. Angle of incidence is equal to the angle of reflection.
(a) Always (b) Sometimes (c) Under special conditions (d) Never
Answer:
The angle of incidence is always equal to the angle of reflection. This is the first law of reflection, therefore, option (a) is correct.
Choose the correct option in Question 8
Q8. Image formed by a plane mirror is
Answer:
The image formed by a plane mirror is virtual, behind the mirror and of the same size as the object . Therefore option (b) is correct.
Q9. Describe the construction of a kaleidoscope.
Answer:
To make a kaleidoscope, get three rectangular mirror strips each about 15 cm long and 4 cm wide. Join them together to form a prism as shown in Fig. (a). Fix this arrangement of mirrors in a circular cardboard tube or tube of a thick chart paper. Make sure that the tube is slightly longer than the mirror strips. Close one end of the tube by a cardboard disc having a hole in the centre, through which you can see [Fig (b)]. To make the disc durable, paste a piece of the transparent plastic sheet under the cardboard disc. At the other end, touching the mirrors, fix a circular plane glass plate [Fig (c)]. Place on this glass plate several small pieces of coloured glass (broken pieces of coloured bangles). Close this end of the tube by a ground glass plate. Allow enough space for the colour pieces to move around.
Q10. Draw a labelled sketch of the human eye.
Answer:
The human eye consists of retinae, lens, cornea, optic nerve, iris, ciliary muscle
Answer:
Laser light can harm the eye if looked at directly because of its high intensity and therefore Gurmit's teacher advised her to not use it.
Q12. Explain how you can take care of your eyes.
Answer:
We can take care of our eyes by following the following steps:
(i) Keeping a distance of at least 25 cm between our eyes and a book while reading it.
(ii) Not looking at a laptop or TV screen for a long time.
(iii) Regularly cleaning our eyes.
(iv) Visiting an ophthalmologist regularly.
Answer:
The angle of incidence = angle of reflection. since the angle between the incident and reflected ray is 90 degrees. the angle of incidents will be 90/2 =45 degrees
Answer:
An infinite number of images of the candle will be formed because when an object is placed between to parallel plane mirrors an infinite number of images are formed.
Answer:
We use the first law of reflection to draw the path of the ray. It states the angle of incidence is equal to the angle of reflection.
Answer:
Boojho cannot see himself in the mirror because of the short length of the mirror. He would be able to see objects at position P and Q but not at R.
Q17. (a) Find out the position of the image of an object situated at A in the plane mirror (Fig. 16.21).
(b) Can Paheli at B see this image?
(c) Can Boojho at C see this image?
(d) When Paheli moves from B to C, where does the image of A move?
Answer:
(a) The image of object A forms behind the mirror at a distance equal from the mirror equal to the distance between the object and the mirror.
(b) Yes. Paheli at B can see this image.
(c) Yes. Boojho at C can see this image.
(d) Image of the object at A will not move. It will remain in the same position when Paheli moves from B to C.
Subject matter experts from Careers360 have created a comprehensive class 8 science chapter 16 question answe, presented in easy-to-understand language and step-by-step. The solution includes a total of seventeen questions, consisting of MCQs, fill-in-the-blanks, and short answer types. Students can also download the class 8 chapter 16 science solution and use it as a reference to reinforce their understanding of the chapter. In addition, the solutions have been curated keeping in mind the latest curriculum and are aimed at helping students score well in their exams.
NCERT Solutions For Class 8 Science- Chapter-Wise
Chapter 1 | |
Chapter 2 | |
Chapter 3 | |
Chapter 4 | |
Chapter 5 | |
Chapter 6 | |
Chapter 7 | |
Chapter 8 | |
Chapter 9 | |
Chapter 10 | |
Chapter 11 | |
Chapter 12 | |
Chapter 13 | |
Chapter 14 | |
Chapter 15 | |
Chapter 16 | |
Chapter 17 | |
Chapter 18 |
Class 8 Science Chapter 16 NCERT Solutions: Important Formulas and Diagrams
Laws of Reflection
Reflection is the process in which light, sound, or any other wave bounces back after striking a surface. When light or sound waves encounter a surface, they can't pass through it, so they bounce off. This bouncing back of waves is called reflection.
The law of reflection states that when a light ray or any other wave encounters a reflecting surface, the angle at which it strikes the surface (angle of incidence) will be equal to the angle at which it bounces off (angle of reflection). Both the incident and reflected rays, along with the normal line perpendicular to the surface, lie within the same plane. This law applies universally to all reflective surfaces.
Image formation in a plane mirror
In a plane mirror, the image formed is virtual, erect, and laterally inverted, appearing at the same distance as the object, with the angle of incidence equal to the angle of reflection.
Number of Images(n)
n= (360o/θ)-1
Human Eye
NCERT Solutions for Class 8 Science Chapter 16 Light: Points to Remember
- All surfaces reflect light.
- Reflection can be regular and diffused, depending on whether the surface is smooth or rough.
- Regular reflection takes place through smooth surfaces whereas diffused reflection occurs through rough surfaces.
- Questions on this concept are explained in NCERT solutions for Class 8 Science Chapter 16 Light
- There are two laws of reflection which can be stated as-
(i) The angle of incidence is equal to the angle of reflection.
(ii) The incident ray reflected ray and the normal drawn at the point of incidence to the reflecting surface, lie in the same plane. The details of the terms used will be studied in NCERT solutions for Class 8 Science chapter 16 Light.
- When two mirrors are combined at particular angles, they give multiple images.
- Kaleidoscope is one of the applications of multiple reflections that help in making beautiful patterns. Question number 9 in the NCERT solutions for Class 8 Science chapter 16 Light explains the construction of kaleidoscope.
- The plane mirror forms laterally inverted images
- Braille system helps visually impaired persons to read
NCERT chapter 16 Light also explains the structure of the eye and its functioning. It also deals with how we can take care of our eyes. Question 10 in the NCERT Solutions for Class 8 Science chapter 16 Light shows a labelled structure of the human eye.
Light Class 8 Science Chapter 16-Topics
Topics for science chapter 16 class 8 are given below:
- What makes Things Visible
- Laws of Reflection
- Regular and Diffused Reflection
- Reflected Light Can be Reflected Again
- Multiple Images
- Sunlight — White or Coloured
- What is inside Our Eyes?
- Care of the Eyes
- Visually Challenged Persons Can Read and Write
- What is the Braille System?
Key Features of Light Class 8 Questions and Answers
Comprehensive Coverage: Theselight class 8 ncert solutions cover all the important topics related to "Light" in the Class 8 curriculum.
Concept Clarity: The class 8 science chapter 16 question answer provides clear and concise explanations to ensure students understand the concepts thoroughly.
Variety of Questions: The questions cover a range of topics, including laws of reflection, the behaviour of light, and practical applications.
Practice Questions: Multiple practice class 8 science chapter 16 ncert solutions help students reinforce their understanding and problem-solving skills.
Visual Aids: Diagrams and illustrations are included in class 8 light ncert solutions where relevant to enhance understanding.
Real-Life Examples: The light class 8 questions and answers often include real-life scenarios to help students relate to the concepts.
Free Access: These class 8 science ch 16 question answer are freely accessible, making them available to all students for study and revision.
These features make science chapter 16 class 8 "Light" Questions and Answers a valuable resource for students, facilitating their understanding of the subject and preparation for exams.
Also Check NCERT Books and NCERT Syllabus here:
NCERT Solutions For Class 8: Subject-Wise
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