Page 14 - Science E-Book Prep.3 2024-2025 1st term_ unit 2_Neat

Science Department
Prep.3

Unit two:
Lesson 2: "Lenses"

Uses of lenses:

1- In medical eyeglasses used for reading or walking.
2- For the person who fixes the watch to see the minute parts of the watch.
3- In the wars, leaders use binoculars to follow the battles.
4- In manufacture of projectors, cameras and magnified lenses.

Types of lenses:

There are two types of lenses:
1- Convex lens (converging lens) 2- Concave lens (diverging lens)

Convex lens Concave lens

Thick at the center and less Thin at the center and more thick at
thickness at the tip the tips.

It collects light rays which It separates light rays which fall on it.
fall on it

What's the difference between the convex lens and the concave lens?

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