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Direct the light reflected by the mirror on to a sheet of paper held close to the mirror. Move the sheet of paper back and forth gradually until you find on the paper sheet a bright, sharp spot of light. Hold the mirror and the paper in the same position for a few minutes.
Fix a white sheet of paper on a drawing board or a table. Take a. comb and close all its openings except one in the middle. You can use a strip of black paper for this purpose. Hold the comb perpendicular to the sheet of paper. Throw light from a torch through the opening of the comb from one side (Fig. 16.1).
- 8.2 DISPLACEMENT CURRENT
- E Φ d μ 0 ε 0
- 8.3.1 Sources of electromagnetic waves
- 8.3.2 Nature of electromagnetic waves
- 8.4.2 Microwaves
- 8.4.3 Infrared waves
We have seen in Chapter 4 that an electrical current produces a magnetic field around it. Maxwell showed that for logical consistency, a changing electric field must also produce a magnetic field. This effect is of great importance because it explains the existence of radio waves, gamma rays and visible light, as well as all other forms of electrom...
d t (Gauss’s Law for electricity) (Gauss’s Law for magnetism) (Faraday’s Law) (Ampere – Maxwell Law)
How are electromagnetic waves produced? Neither stationary charges nor charges in uniform motion (steady currents) can be sources of electromagnetic waves. The former produces only electrostatic fields, while the latter produces magnetic fields that, however, do not vary with time. It is an important result of Maxwell’s theory that accelerated char...
It can be shown from Maxwell’s equations that electric and magnetic fields in an electromagnetic wave are perpendicular to each other, and to the direction of propagation. It appears reasonable, say from our discussion of the displacement current. Consider Fig. 8.2. The electric field inside the plates of the capacitor is directed perpendicular to ...
Microwaves (short-wavelength radio waves), with frequencies in the gigahertz (GHz) range, are produced by special vacuum tubes (called klystrons, magnetrons and Gunn diodes). Due to their short wavelengths, they are suitable for the radar systems used in aircraft navigation. Radar also provides the basis for the speed guns used to time fast balls, ...
Infrared waves are produced by hot bodies and molecules. This band lies adjacent to the low-frequency or long-wave length end of the visible spectrum. Infrared waves are sometimes referred to as heat waves. This is because water molecules present in most materials readily absorb infrared waves (many other molecules, for example, CO 2, NH 3, also ab...
Apr 16, 2024 · Class 8 Science Chapter 16 : Light is an essential and captivating aspect of our lives, providing illumination, allowing us to see the world around us, and playing a crucial role in various natural and technological processes. Chapter 16 of the Class 8 Science NCERT textbook delves into the mesmerizing realm of light, shedding light on its properties, behavior, and applications.
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So if you are in 8th standard, and studying Science textbook (named Science), then you can read Ch 13 here and afterwards use NCERT Solutions to solve questions answers of Light. NCERT Book Class 8 Science Chapter 13 Light. The complete Chapter 13, which is Light, from NCERT Books for Class 8 Science is as follows.
- Science
- Ch 13
- Light
- Science
In this chapter, students will learn about the different properties of light and their sources. Along with these, they will be introduced to the laws of reflection and how a human eye works or how eyes see images. Solve and practise higher-order thinking questions of this chapter from NCERT Exemplar Class 8 Science Chapter 16 Light.
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NCERT Class 8 Science Chapter Light Question Answer provides clear explanations of concepts covered in the chapter, helping students understand the topic of light thoroughly. Light Chapter Of Class 8 PDF Questions And Answers cover important concepts such as the properties of light, reflection, refraction, and the functioning of the human eye.
