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13. LIGHT

The chapter explores the properties of light, specifically its reflection and the formation of images by mirrors. It explains the laws of reflection, types of reflection, and the structure of the human eye, emphasizing the importance of vision. Additionally, it addresses the challenges faced by visually impaired individuals and introduces the Braille system as a means for reading and writing.

Sections

  • 13

    Light

    This section discusses how light enables us to see objects, including the laws of reflection, the formation of images using mirrors, and the role of the human eye.

    Learning Practice

  • 13.1

    What Makes Things Visible

    This section explains that the visibility of objects depends on light, which can either be emitted by the object itself or reflected from other sources.

    Learning Practice

  • 13.2

    Laws Of Reflection

    This section discusses the laws of reflection, emphasizing the behavior of light when it encounters reflective surfaces.

    Learning Practice

  • 13.2.1

    Activity 13.1

    This section explores how light makes objects visible, introducing the laws of reflection through hands-on activities.

    Learning Practice

  • 13.2.2

    Activity 13.2

    This section describes an activity that demonstrates the laws of reflection using light rays and mirrors.

    Learning Practice

  • 13.2.3

    Activity 13.3

    This section explains the formation of virtual images using a plane mirror and the laws of reflection.

    Learning Practice

  • 13.3

    Regular And Diffused Reflection

    This section discusses the concepts of regular and diffused reflection, highlighting how light behaves differently on smooth and rough surfaces.

    Learning Practice

  • 13.3.1

    Activity 13.4

    Activity 13.4 demonstrates the concept of diffused reflection using parallel rays on an irregular surface.

    Learning Practice

  • 13.4

    Reflected Light Can Be Reflected Again

    This section explains how reflected light can be further reflected using mirrors, illustrating concepts like periscopes and applications in daily life.

    Learning Practice

  • 13.5

    Multiple Images

    This section discusses how using multiple mirrors can create numerous images of an object through reflection.

    Learning Practice

  • 13.5.1

    Activity 13.5

    This section explores how multiple images can be formed by plane mirrors and introduces activities to observe this phenomenon.

    Learning Practice

  • 13.6

    Sunlight — White Or Coloured

    Sunlight is comprised of various colors, which can be demonstrated through experiments illustrating its dispersion.

    Learning Practice

  • 13.7

    What Is Inside Our Eyes?

    This section explores the structure and function of the human eye, detailing its key components and their roles in vision.

    Learning Practice

  • 13.7.1

    Activity 13.7

    This section explains how sunlight can be separated into various colors using a prism setup with water and a mirror.

    Learning Practice

  • 13.7.2

    Activity 13.8

    This section focuses on the reaction of the human pupil to changing light intensities, highlighting the importance of pupil size in regulating light entry into the eye.

    Learning Practice

  • 13.7.3

    Activity 13.9

    This section discusses the concept of the blind spot in human vision and the activities involved in exploring this phenomenon.

    Learning Practice

  • 13.8

    Care Of The Eyes

    Proper care of the eyes is essential for maintaining good vision and preventing eye disorders.

    Learning Practice

  • 13.9

    Visually Impaired Persons Can Read And Write

    This section explores how visually impaired individuals utilize their other senses for reading and writing, primarily through the Braille system.

    Learning Practice

  • 13.9.1

    What Is The Braille System?

    The Braille system, created by Louis Braille for visually challenged individuals, serves as a crucial tool for reading and writing through tactile dots.

    Learning Practice

  • 13.9.1.1

    Louis Braille

    Louis Braille developed a revolutionary system of reading and writing for the visually impaired, enhancing their ability to communicate and access information.

    Learning Practice

  • 13.9.1.2

    Non-Optical And Optical Aids For Visually Impaired

    The section discusses various aids available for visually impaired persons, including non-optical and optical aids.

    Learning Practice

  • 13.10

    Did You Know?

    This section discusses the different types of vision in animals and the Braille system for visually impaired people.

    Learning Practice

References

NCERT Study Material

Class Notes

Memorization

What we have learnt

  • Light is reflected from all...
  • Regular reflection occurs o...
  • The angle of incidence equa...

Final Test

Revision Tests

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