‫مدرسة الطالب الذكي الخاصة _ األنصب‬
ALTALIB ALTHAKI PRIVATE SCHOOL_ AL ANSAB
Academic Year 2025-2026
Semester 2
Unit 5 – Light
Unit 5.1 How We See Things
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Light source: Sun, lamp, candle.
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Objects: Seen when light reflects into our eyes.
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Ray diagram: Shows light in straight lines.
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Arriving ray: Comes from source.
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Reflected ray: Bounces off object.
Arriving ray
Reflected
ray
Unit 5.2 Light Travels in Straight Lines
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Light: Always in straight lines, not curves.
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Proof: Flashlight through tube shows this.
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Rays: Spread in all directions until they hit something.
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Unit 5.3 Light reflects off different surfaces.
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Mirror: Smooth, shiny, gives clear image.
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Rough surfaces: Wood, paper absorbs light, poor reflection.
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Uses: Dentist, car mirror, shop mirror.
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Good reflectors: Mirror, shiny metal, smooth glass.
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Bad reflectors: Wood, paper, cloth, rough stone.
Unit 5.4 Light in the Solar System
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Sun: A star, main source of light.
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Planets/Moon: Reflect Sun’s light.
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Earth orbit: 1 year.
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Moon orbit: 29 days.
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Solar system: Sun, 8 planets, moons, asteroids, comets.
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Asteroids: Rocky, mostly in asteroid belt.
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Moons: Orbit planets (Earth has 1, Uranus has Titania).
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Comets: Ice and dust with tails.
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Unit 5.5 Day and Night
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Earth: Spins on axis every 24 hours.
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Day: Facing Sun.
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Night: Facing away.
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Spin: Anticlockwise direction.
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Unit 5.6 Investigating shadow length.
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Shadow: Formed when object blocks light.
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Source: Sun or any object that has light.
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Midday: Shadows are short. (12 noon)
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Morning/afternoon: Shadows are long.
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Pattern: Shadows change as Earth spins.
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