Science (Class 8) [8]

301 96 92MB

English Pages [192]

Table of contents :
Initial Pages Final Convert to Path.pdf
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Chaputer-1.pdf
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Chaputer-2.pdf
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Chaputer-3.pdf
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Chaputer-4.pdf
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Chaputer-5.pdf
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Chaputer-6.pdf
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Chaputer-7.pdf
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Chaputer-8.pdf
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Chaputer-9.pdf
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Chaputer-10.pdf
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Chaputer-11.pdf
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Chapter 12 English.pdf
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Objective (lens)

Focus (image) Eyepiece (lens)

Incoming light from object

Eyepiece (lens)

Eye

Eye Focus (image) Objective (lens)

Incoming light from object Secondary mirror

Figure 12.2: Ray diagram of a Reflecting Telescope

Wave Length in Nenometer

Visible Light

Figure 12.3: Spectrum of white light and its wavelength distribution

All red light from sun focused here Red light

Opaque barrier Narrow beam of light

Screen or detector

Blue light All blue light focused here Prism

Incoming light

Light source (hot bulb)

Lens

Lens

Figure 12.4: Main parts of a Spectroscope and their working

Soyuz Space Craft

Apollo-17 Command Module

International Space Station (ISS) Figure 12.5 Examples of manned spacecrafts

Figure 12.6: Examples of un-manned spacecrafts

Figure 12.7: Artistic view of GPS satellites in orbiting around the Earth

Shorter wavelength

Longer wavelength

Wavelength

Figure 12.8: A Weather Satellite

Figure 12.9: A Remote sensing satellite imaging Earth

Figure 12.11: Damage caused by space debris on US Space Shuttle

Figure 12.12: Twin brothers Mark and Scott Kelly. Mark spent a year on ISS in space to study long term space travel effects

Figure 12.13: A satellite Launch Facility

Figure 12.14: A robotic arm on ISS