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NCERT Class 6 Science Chapter 8 Notes are created by subject experts who have tried to incorporate all important concepts and definitions here. Also, we have explained concepts via pictures to help you understand the chapter better. Moreover, we have provided examples to easily explain scientific terms and concepts included in the CBSE Class 6 Science Chapter- “Light, Shadows, and Reflection”. Further, we have also provided NCERT solutions for all Exercise questions in this chapter. Use these solutions to ace your tests and improve your understanding of light, formation of shadows, reflection of light, and images. Keep Reading!!
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Summary of NCERT Class 6 Science Chapter 8
Class 6 Science Chapter 8- “Light, Shadows, and Reflection” explains light and its properties and associated concepts. These concepts include the classification of objects based on the emission of light and interaction with light. Also, the chapter helps us understand shadow formation, pinhole camera and image formed by it, mirror and reflection, and properties of images.
Light Shadow and Reflection Class 6 Notes
Let us now dive into the important concepts in NCERT Class 6 Science Chapter 8 and learn everything related to the topics!!
Properties of Light
Light is a form of energy that has the following properties:
- It travels in a straight line
- It is an invisible energy form.
- It enables us to see objects.
- The sensation that enables us to view things is termed vision or sight.
Also Read: Refraction of Light: Meaning, Applications & Examples
Rectilinear Propagation of Light
Light emerging from the source always takes the shortest and quickest path to reach a point. Therefore, it always travels in a straight line. This is termed as rectilinear propagation of light.
Classification of Objects on the Basis of Emission of Light
Based on the emission of light, objects around us are classified into luminous and non-luminous objects.
- Luminous Object: Any object that emits heat and light is called a luminous object. For instance, the Sun, stars, candle flame, and bulbs.
- Non-Luminous Object: Any object that does not emit light but reflects the light produced by any luminous object is termed a non-luminous object. For instance, houses, trees, the Earth, and the moon.
Classification of Objects on the Basis of Their Interaction with Light
Based on absorption or interaction with light, objects in our surroundings are categorised into transparent, translucent, and opaque materials.
- Transparent Object: Any item that allows light to pass is called a transparent object. For instance, a glass door, a wine glass, spectacles, and clear water.
- Translucent Object: Any item that allows light to pass through partially is termed a translucent object. For instance, a wax paper, a butter paper, and a cotton cloth.
- Opaque Object: Any item that does not allow light to pass is known as an opaque object. For instance, a desk, a bed, a tree, and a wall.
Shadow Formation
Here is how a shadow is formed:
- When an opaque item blocks the light, a shadow is created.
- Where a shadow is formed, a screen is required, such as the ground, a room’s walls, or even the surfaces of structures.
- We can determine the forms of various things by their shadows. Additionally, it may even deceive us regarding the shape of various items. For instance, on the screen, the shadow of a cone seems to be a triangle.
Also Read: Zero Shadow Day in India
Pinhole Camera
It is a device that helps us study the rectilinear properties of light. Here are some features of images formed through a pinhole camera:
- The image is inverted
- The image is coloured
- The image is smaller in size than the original image.
Mirror
A mirror is a shiny, flat surface that reflects light in either the same or different directions. Here are the different types of mirrors:
- Plane Mirror
- Concave Mirror
- Convex Mirror
Reflection
Light reflects or bounces back as it strikes a surface. Any surface that is extremely glossy or well-polished functions as a mirror. Reflection describes the phenomena of light bouncing off of surfaces.
Also Read: Total Internal Reflection: Definition, Properties & Examples
Characteristics of an Image
A plane mirror forms the same size image as that of the object. Whereas, a concave mirror and convex mirror form a bent-in image and bulged-out image of an object, respectively. Here are some characteristics of images:
- In contrast to shadows, images have colour. They are created as a result of light rays that converge after reflecting off of things.
- The actual convergence of light beams creates a real image. On a screen, real images constantly emerge.
- The apparent convergence of light rays that are diverging creates a virtual image. On a screen, virtual images are impossible to obtain.
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Important Definitions in NCERT Class 6 Science Chapter 8
Here are the definitions included in CBSE Class 6 Science Chapter 8.
Light
It refers to the natural agent that helps us see objects. It is a form of energy that originates from different sources like the sun, candle flame, electric bulb, electric torch, and stars.
Ray of Light
It refers to the path in which light travels in a given direction.
Beam of Light
A bunch of rays of light is known as a beam of light.
Range of Visibility
It refers to the horizontal distance at which a huge dark object is seen against the horizon during daytime. This distance is measured in miles or kilometres (km).
Also Read: Basic Physics Formulas & Notes for Competitive Exams
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Important Questions and Answers in CBSE Class 6 Science Chapter 8
In this section, we are going to learn answers to all the questions in NCERT Class 6 Science Chapter 8. These NCERT solutions are as per the latest CBSE curriculum.
Ques 1: Rearrange the following boxes to form a sentence that helps us understand opaque objects:
| OWS | AKE | OPAQ | UE O | BJEC | TS M | SHAD |
Ans: These boxes form a sentence- “Opaque Objects Make Shadows”. The boxes can be arranged as follows:
| OPAQ | UE O | BJEC | TS M | AKE | SHAD | OWS |
Ques 2: Classify the following objects into luminous or non-luminous and transparent, translucent, or opaque objects.
Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a
sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot
iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper,
the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of
cellophane, a wire mesh, a kerosene stove, a sun, a firefly, moon.
Ans:
Here are luminous and non-luminous objects:
| Luminous | Non-Luminous |
| A piece of red hot iron, a lighted fluorescent tube, the flame of a gas burner, a lighted torch, sun, firefly, kerosene stove | Air, water, a piece of rock, a sheet of aluminum, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard, a sheet of cellophane, a wire mesh, moon |
Here are transparent, translucent, and opaque objects:
| Transparent | Translucent | Opaque |
| Air, water, and a sheet of plane glass | A sheet of polythene, smoke, fog, a sheet of cellophane, and a wire mesh | A piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard |
Ques 3: If you hold up a mirror in front of you in a pitch-black space, will you be able to see your own reflection?
Ans: No. A mirror cannot generate an image in a dark room as it requires light to reflect the image.
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FAQs
Ans: It refers to the path in which light travels in a given direction.
Ans: It refers to the horizontal distance at which a huge dark object is seen against the horizon during daytime.
Ans: Light emerging from the source always takes the shortest and quickest path to reach a point. Therefore, it always travels in a straight line. This is termed as rectilinear propagation of light.
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