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NCERT Solutions for Class 8 Science Chapter 13 Light

NCERT Solutions for Class 8 Science Chapter 13 Light

Edited By Vishal kumar | Updated on Jul 22, 2025 11:57 PM IST

The role of light in our life is a very essential one, and we normally do not even realize that. When you are looking in a mirror and all of a sudden the lights turn of, do you see yourself in the mirror? No, of course not, because with no light our eyes will not see anything. This is a basic example to show our dependence on light to see the world we are in. The textbook chapter 10 Light, of NCERT Class 8 Science aims at providing students with basic introduction to such concepts as reflection, the kind of mirrors, and formation of images, so that an ordinary consumer could understand the scientific reasons behind their everyday experience.

This Story also Contains
  1. NCERT Solutions for Class 8 Science Chapter 10 Light: Download Solution PDF
  2. NCERT Solutions for Class 8 Science Chapter 10 Light: Solved Exercise Questions
  3. Class 8 Science Chapter 10 NCERT Solutions: Topics
  4. Class 8 Science Chapter 10 NCERT Solutions: Important Formulas
  5. NCERT Chapter-Wise Solutions For Class 8th Science
NCERT Solutions for Class 8 Science Chapter 13 Light
NCERT Solutions for Class 8 Science Chapter 13 Light

To ensure that learning is easy and productive, NCERT Solutions of Class 8 Science Chapter 10 Light is a complete reference to prepare on questions on the topic and make all concepts understandable. These solutions are specially prepared by subject experts so that the students are well versed about every topic without confusions. The NCERT Solutions for Class 8 Science contain solved exercise questions, significant formulas and topics like laws of reflection, angle of incidence and angle of reflection definitions and, rules of image formation.

NCERT Solutions for Class 8 Science Chapter 10 Light: Download Solution PDF

NCERT Solutions Class 8 Science Chapter 10 Light consist of concise and clear answers to all the textbook questions, which can be used by the students to master the important concepts easily. These solutions come in free downloadable PDF format which can be used to study and revise at offline.

NCERT Solutions for Class 8 Science Chapter 10 Light: Solved Exercise Questions

Q1. Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.

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.

Q2. Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

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.

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.

Q5. Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence 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.

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Q6. Fill in the blanks in the following.

(a) A person 1 m in front of a plane mirror seems to be _______________ m away from his image.
(b) If you touch your ____________ ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with ____________.
(c) The size of the pupil becomes ____________ when you see in dim light.
(d) Night birds have ____________ cones than rods in their eyes.

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.

Q7: Choose the correct option:

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

(a) virtual, behind the mirror and enlarged.
(b) virtual, behind the mirror and of the same size as the object.
(c) real at the surface of the mirror and enlarged.
(d) real, behind the mirror and of the same size as the object.

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.

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Q10. Draw a labelled sketch of the human eye.

Answer:

The human eye consists of the retina, lens, cornea, optic nerve, iris, ciliary muscle

Q11. Gurmit wanted to perform Activity 16.8 using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher’s advice?

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.

Q13. What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

Answer:

The angle of incidence = angle of reflection. Since the angle between the incident and reflected ray is 90 degrees. The angle of the incident will be 90/2 =45 degrees

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Q14. How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

Answer:

An infinite number of images of the candle will be formed because when an object is placed between two parallel plane mirrors, an infinite number of images are formed.

Q15. Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown in Fig. Draw the reflected ray from the second mirror.

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.

1659590768280

Q16. Boojho stands at A just on the side of a plane mirror as shown in Fig. Can he see himself in the mirror? Also, can he see the image of objects situated at P, Q and R?

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.

(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?

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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.

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(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.

Class 8 Science Chapter 10 NCERT Solutions: Topics

Class 8 Science Chapter 13 NCERT Solutions: Light covers all essential topics that explain how light behaves, how images are formed, and the laws of reflection. These topics are crucial for building a strong understanding of the nature and properties of light.

13.1 What makes Things Visible
13.2 Laws of Reflection
13.3 Regular and Diffused Reflection
13.4 Reflected Light Can be Reflected Again
13.5 Multiple Images
13.6 Sunlight — White or Coloured
13.7 What is inside Our Eyes?
13.8 Care of the Eyes
13.9 Visually Impaired Persons Can Read and Write
13.10 What is the Braille System?

Class 8 Science Chapter 10 NCERT Solutions: Important Formulas

Class 8 Science Chapter 10 includes important formulas that help students understand concepts like the laws of reflection, image formation, and angles of incidence and reflection. These formulas are key tools for solving related numerical and conceptual questions.

Law of Reflection:

The law of reflection says that when light hits a shiny surface, it bounces off at the same angle it came in. This means the angle of incidence (incoming ray) is equal to the angle of reflection (outgoing ray). The incident ray, the reflected ray, and the normal (an imaginary line at 90° to the surface) all lie on the same flat surface or plane. This rule works for all reflective surfaces, like mirrors.

Image Formation in a Plane Mirror:
When you look into a plane mirror, the image you see is virtual (it can’t be caught on a screen), upright (erect), and laterally inverted (left appears right and vice versa). The image appears to be the same distance behind the mirror as the object is in front of it, and it’s formed by light following the law of reflection.

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Number of Images(n)

n=(360∘/θ)−1

Human Eye

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NCERT Chapter-Wise Solutions For Class 8th Science

The chapter-wise NCERT solutions for all the science chapters are listed here along with their links:

NCERT Solutions for Class 8 Science Chapter 1 Crop Production and Management

NCERT Solutions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe

NCERT Solutions for Class 8 Science Chapter 3 Coal and Petroleum

NCERT Solutions for Class 8 Science Chapter 4 Combustion and Flame

NCERT Solutions for Class 8 Science Chapter 5 Conservation of Plants and Animals

NCERT Solutions for Class 8 Science Chapter 6 Reproduction in Animals

NCERT Solutions for Class 8 Science Chapter 7 Reaching the Age of Adolescence

NCERT Solutions for Class 8 Science Chapter 8 Force and Pressure

NCERT Solutions for Class 8 Science Chapter 9 Friction

NCERT Solutions for Class 8 Science Chapter 10 Sound

NCERT Solutions for Class 8 Science Chapter 11 Chemical Effects of Electric Current

NCERT Solutions for Class 8 Science Chapter 12 Some Natural Phenomena

NCERT Solutions for Class 8 Science Chapter 13 Light

NCERT Solutions For Class 8: Subject-Wise

Also Check NCERT Books and NCERT Syllabus here:

Frequently Asked Questions (FAQs)

1. What is light?

Light is the smallest quantity of energy that can be transported  a photon an elementary particle without a real size that can be split, only created or destroyed    

2. What is the difference between real and virtual images?

Real image can be formed on a screen; formed by converging rays.  Virtual image cannot be formed on a screen; formed by diverging rays appearing to meet.

3. What is the role of the iris in the human eye?

The iris controls the size of the pupil and hence the amount of light entering the eye.

4. What is reflection?

Reflection is when a wave hits a boundary and bounces back in the opposite direction with the same frequency, wavelength, and speed. The angle of incidence equals the angle of reflection.

5. Why do we see objects in a mirror at the same distance behind the mirror?

Because the plane mirror reflects light in such a way that it appears to come from a point behind the mirror, creating a virtual image at the same distance.

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