Light Chapter Class 8 Science (Chapter 16) in One Shot | BYJU'S - Class 8

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Welcome, Achievers! In today’s episode of BYJU'S Champions, our BYJU’S expert explains CBSE Class 8 chapter "Light" in one shot.

This is a very informative session, as Saurabh Sir teaches in depth about the laws of reflection, types of reflection, multiple reflection, kaleidoscopes, dispersion of light, and the human eye in one shot.

Saurabh Sir leads you through the concepts in a very interesting way. So make sure to watch the video till the end and use the live chat box to clear your doubts.

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Introduction to Light

Light is a fundamental aspect of our perception of the world around us. It enables us to see and interact with objects. In the context of Class 8 Science, understanding light involves exploring its properties, behavior, and how it interacts with different surfaces.

Nature of Light

Light behaves as both a particle and a wave. It travels in straight lines and can be reflected, refracted, or absorbed by different materials. The phenomenon of reflection is particularly significant, as it allows us to see objects. When light hits an object, some of it is reflected back to our eyes, enabling us to perceive the object's shape and color.

Reflection of Light

The concept of reflection involves the bouncing back of light rays when they strike a surface. This process can be categorized into two types: regular (or specular) reflection and diffuse reflection. Regular reflection occurs on smooth surfaces, such as mirrors, producing clear images. In contrast, diffuse reflection happens on rough surfaces, scattering light in multiple directions, resulting in unclear images.

Laws of Reflection

The laws of reflection are crucial to understanding how light behaves. The first law states that the angle of incidence equals the angle of reflection; both angles are measured from the normal, an imaginary line perpendicular to the surface at the point of incidence. The second law asserts that the incident ray, reflected ray, and normal all lie in the same plane.

Human Eye and Vision

The human eye is an intricate organ responsible for vision. Light enters through the cornea, passes through the pupil, and is focused by the lens onto the retina, where it forms an image. The retina contains photoreceptor cells that convert light into neural signals, which are sent to the brain via the optic nerve. This process allows us to perceive colors and shapes.

Color and the Spectrum

White light is composed of multiple colors, which can be observed when it is refracted through a prism or during natural phenomena such as rainbows. The spectrum of light includes seven colors: red, orange, yellow, green, blue, indigo, and violet. Each color has a different wavelength, contributing to its unique properties.

Applications of Light

Light has numerous applications in everyday life, such as in optical instruments like periscopes and telescopes, which utilize reflection and refraction to enhance our ability to observe distant objects. Understanding light is also essential in fields such as photography and astronomy.

Conclusion

In summary, the study of light encompasses its nature, behavior, and significance in our daily lives. By grasping these concepts, students can appreciate the role light plays in enhancing our understanding of the world, preparing them for advanced studies in physics and related fields.


plss give a like it took a long time to type

VysruCp
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00:16 Preparing for Class 8th light chapter
04:04 Light enables us to see and understand the world around us.
09:01 Reflection, angle of incidence, and normal in light.
12:14 First law: Angle of incidence is equal to angle of reflection
19:06 Mirror reflection explained: regular vs. diffuse.
21:50 Understanding irregular reflection and its impact on the surface
27:39 Symmetrical letters are reflected the same in a mirror
30:32 Properties of Image Formation by Plane Mirror
36:02 Creating beautiful patterns using multiple reflections
38:06 Take help now for small information, as you won't get another chance later
43:05 White light splits into its constituent colors
45:17 Pupil size changes with light intensity
49:24 Optic nerve and blind spots explained
52:46 Transition from bright light to darkness activates cells inside our eyes
57:10 Taking a break for 2-3 minutes is important for children's learning

harshilshaji
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Ek kaam Karo pahle bacchon se hi baat kar lo baad main padhana 😂😅

siddharthallgamingsg
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Kon kon comments padhna aya hai 😂😂 you are legend
Atendence lag va lo👍

neerajthakran
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Important Topics covered:
00:16 Preparing for Class 8th light chapter
04:04 Light enables us to see and understand the world around us.
09:01 Reflection, angle of incidence, and normal in light.
12:14 First law: Angle of incidence is equal to angle of reflection
19:06 Mirror reflection explained: regular vs. diffuse.
21:50 Understanding irregular reflection and its impact on the surface
27:39 Symmetrical letters are reflected the same in a mirror
30:32 Properties of Image Formation by Plane Mirror
36:02 Creating beautiful patterns using multiple reflections
38:06 Take help now for small information, as you won't get another chance later
43:05 White light splits into its constituent colors
45:17 Pupil size changes with light intensity
49:24 Optic nerve and blind spots explained
52:46 Transition from bright light to darkness activates cells inside our eyes

thestudyhiveofficial
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Vote for surabh sir

SURABH SIR 👍. 👇

manujoji
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Kon kon Ek din Phele video dhek raha hai 😂😂😂

anjuanju
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Sir you teach very good and entertaining

ayushkumarmahatha
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After 2 days my science exam is there please hope for me 😥

rashi_rahamatkar
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Good explanation according to I like this channel👌🙂🆗✨✨

satyamyadav
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Thankyou sir for this session 😃😃 you made all concepts easy

gunguntagore
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My exam is in like a week this helped a lot thank u so much ❤😊😊

meenakshialexzander
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Sir I have a doubt in laws of reflection
*If angle of incident is 30 the how is angle of reflection is 60

yashitha
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What the hell he is only wasting time on seeing comment's
Thanks for 12 likes

amritadevi
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last mein toh book se hi padna padta hain sari definition😢😢😢...

kartikchandra
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video starts from 4:28, thank me later...

okdude
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sir I have a doubt, when we use a light or a ray we cant see in the air. Why?

lingeshachs
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Best of luck for your tomorrow exam 😂😂😂😂😂

xyz...
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Who got 99% in science 🧪 🧬🔭🔬⚗️🧫🥼👨‍🔬👩‍🔬🧑‍🔬

hauntedblueeagle
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Sir which part of eye give it it's colour and how? There is a white portion of eye for which reason it is?

snowflake