Classify the following into transparent, opaque and translucent objects: Wax, spectacles, a heap of salt, a stone, dense smoke, wood, skin, balloon, rubber, membrane of a tabla, blood and milk.

Let's classify the given objects into transparent, opaque, and translucent categories based on their ability to transmit light:

1. Transparent Objects: These are objects that allow light to pass through them with minimal scattering or absorption, resulting in a clear view of objects on the other side.

   Transparent:

   • Wax (Thin layers may be translucent, but thicker layers may appear opaque)
   • Spectacles (Typically made with transparent lenses)
   • Balloon (Most balloons are made from transparent or translucent materials)
   • Membrane of a tabla (The membrane of a tabla drum is typically made from transparent materials like synthetic or animal skin)

2. Opaque Objects: These are objects that do not allow light to pass through them, preventing the transmission of light and the visibility of objects on the other side.

   Opaque:

   • A heap of salt (Salt crystals are typically opaque)
   • A stone
   • Dense smoke (Smoke particles scatter light, making it opaque)
   • Wood (Depending on the type and thickness, wood can be opaque)
   • Skin (Human skin is generally opaque)
   • Rubber (Most rubber materials are opaque)
   • Blood
   • Milk

3. Translucent Objects: These are objects that allow some light to pass through them, but they scatter or diffuse the light, resulting in a hazy or blurred view of objects on the other side.

   Translucent:

   • Wax (Thicker layers of wax may appear translucent)
   • Dense smoke (Depending on its density, smoke can be translucent)
   • Balloon (Some balloons may be made from translucent materials)
   • Rubber (Some rubber materials may be translucent)
   • Membrane of a tabla (The membrane of a tabla drum may appear translucent under certain lighting conditions)

It's important to note that the classification of certain objects, such as wax or rubber, may depend on their thickness or specific properties. Additionally, the classification of materials like skin or wood may vary depending on the context or specific characteristics of the material.