Educational diagram explaining the types of lenses, including convex (converging) and concave (diverging) lenses, with examples and refraction principles.

Problem Analysis:

The task involves identifying and labeling different types of lenses (convex and concave) based on their shapes and understanding how light behaves when passing through them. The goal is to match the labels with the correct lens diagrams and fill in the blanks regarding the behavior of light rays.

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Step-by-Step Solution:

#### 1. Understanding Lens Types:
- Convex Lenses (Converging Lenses): These lenses are thicker at the center and thinner at the edges. They converge parallel light rays to a focal point.
- Concave Lenses (Diverging Lenses): These lenses are thinner at the center and thicker at the edges. They diverge parallel light rays, making them appear to come from a focal point.

#### 2. Identifying Lens Shapes:
The provided labels describe specific types of lenses:
- Plano-convex: One flat surface and one convex surface.
- Plano-concave: One flat surface and one concave surface.
- Double convex: Both surfaces are convex.
- Double concave: Both surfaces are concave.
- Diverging meniscus: Thicker at the edges and thinner in the middle (concave).
- Converging meniscus: Thicker in the middle and thinner at the edges (convex).

#### 3. Matching Labels to Diagrams:
We need to match the labels to the corresponding lens diagrams. Let's analyze each diagram:

- Diagram 1: This lens has two convex surfaces. It is a double convex lens.
- Diagram 2: This lens has one flat surface and one concave surface. It is a plano-concave lens.
- Diagram 3: This lens has one flat surface and one convex surface. It is a plano-convex lens.
- Diagram 4: This lens has two concave surfaces. It is a double concave lens.
- Diagram 5: This lens is thicker at the edges and thinner in the middle. It is a diverging meniscus lens.
- Diagram 6: This lens is thicker in the middle and thinner at the edges. It is a converging meniscus lens.

#### 4. Filling in the Blanks:
- Convex Lens Behavior: Parallel light rays passing through a convex lens are refracted towards the focal point. This is because convex lenses converge light rays.
- Concave Lens Behavior: Parallel light rays passing through a concave lens are refracted away from the focal point and appear to come from the focal point. This is because concave lenses diverge light rays.

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Final Answer:

#### Label Matching:
1. Double convex
2. Plano-concave
3. Plano-convex
4. Double concave
5. Diverging meniscus
6. Converging meniscus

#### Blanks Filling:
- Convex lens: Parallel light rays are refracted towards and converge to a point called the focal point after passing through a convex lens.
- Concave lens: Parallel light rays are refracted away from and appear to come from a point called the focal point after passing through a concave lens.

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Final Boxed Answer:

\[
\boxed{
\text{1. Double convex, 2. Plano-concave, 3. Plano-convex, 4. Double concave, 5. Diverging meniscus, 6. Converging meniscus}
}
\]
\[
\boxed{
\text{Convex lens: towards, converge; Concave lens: away from, come from}
}
\]