NCERT Solutions for Class 6 Science Chapter 11
Chapter 11 of Class 6 science covers concepts like opacity, transparent objects, concepts of reflection, formation of image by a pinhole camera, translucent objects, the formation of shadows, mirrors and their uses. As students are introduced to some new concepts in this chapter, they must attempt all the practise questions given at the end of the chapter in the NCERT book.
To help students solve the questions accurately, Extramarks provides NCERT Solutions for Class 6 Science Chapter 11. The answers are written in simple language and explained through relevant examples or images, wherever required.
NCERT Class 6 Science Other Chapters Solutions
Access NCERT Solutions for Science Class 6 Chapter 11- Light, Shadows and Reflections
Chapter 11 – Light, Shadow & Reflection
Light is a form of energy that helps us in seeing different objects around us. When light hits an object, some of its illuminations get reflected. It is because of this reflection that we can see things around us. In the dark, we cannot see any object because there isn’t any reflection and not because there isn’t enough light. Thus, the NCERT Class 6 Science Chapter 11 provided by us will give you a thorough insight into the chapter on light, shadow and reflection.
What are the Sources of Light?
The following are the two sources of light:
- Luminous- A natural or artificial body that emits light on its own. Sun, tube light, and bulb are a few examples.
- Non-Luminous- A body that does not emit light on its own. Moon, mirrors etc are a few examples of non-luminous sources of light.
Note: If we hold a mirror in a dark room, we can’t see objects through it. Thus, we only see things in the mirror because it reflects.
Transparent, Translucent and Opaque
- Transparent: If a source of light passes through an object, such an object is called a transparent object. A few examples of transparent objects include glass, water etc.
- Translucent: If a source of light partially passes through an object, such an object is called a translucent object. A few examples of translucent objects include frosted glass, butter paper etc.
- Opaque: If a source of light is unable to pass through an object, the object is called an opaque object. Such an object completely blocks the path of light. A few examples of such an object include wood, Earth etc.
Formation of Shadows
When an opaque object blocks a source of light, it leads to the formation of a shadow. The opposite side or darker side creates a shadow. The distance between a source of light and an opaque object determines the size of the formed shadow. Here, the angle of light also plays an important role.
Various Sizes of Shadows
- As the source of light comes closer to an opaque object, the size of the shadow tends to increase. On the opposite side, the size reduces as the source of light moves farther away from the object.
- When the shadow falls on a screen, only then the shadow created by an opaque object can be seen. This includes anything from the ground and walls of a room to any surface that can act as a screen.
- In some cases, the shadow formed can provide a lot of information about the object.
- Shadows are always black and are not affected by the change in the colour of the opaque object.
Propagation of Light
Light travels in a straight line. This is known as the rectilinear propagation of light. The chapter discusses two important concepts – Beam of light and Ray of light.
- A beam of light: It is a bunch of rays moving in a specific direction.
- Ray of light: It is the path through which light travels in a specific direction.
Reflection of Surfaces
Light reflects when it bounces off a surface but the nature of such a reflection depends on the type of surface it reflects from. If a source of light falls on an irregular surface, parallel beams of light reflect in different directions on the bases of the angles on the surface. This process is called diffused reflection.
If a source of light falls on a smooth surface, the parallel beams of light will reflect uniformly to a single direction as per the angle of the light. This is called an image.
Key Features of NCERT Solutions for Class 6 Science Chapter 11
At times, students are unable to answer the textbook questions, even after studying the chapter. This is where NCERT Solutions for Class 6 Science Chapter 11 can be helpful. Here are a few benefits of referring to these study materials:
- Students can access the study materials on the website or app of Extramarks.
- The solutions are prepared by subject matter experts who have years of experience in teaching and are well-versed with the latest guidelines of CBSE.
- The answers are accurate and explained with the help of relevant examples.