From among the following objects, list out the opaque, translucent and transparent bodies in the space provided below:
A glass strip, an ordinary paper, greased paper, tracing paper, polythene sheet, wooden piece, steel plate, glycerin, kerosene oil, mustard oil, grounded glass, stone, book, water and milk.

Hint: The objects which allow light to pass through them easily are called transparent objects. The objects which allow light to pass through them only partially are called translucent objects. The objects which do not allow light to pass through them are called opaque objects. Generally, we cannot see clearly through objects which are translucent. The passing of light through a material depends upon the composition of a material.

Complete step-by-step solution:
 The objects which are transparent look clear like water or eye glasses. As light can pass through these types of objects, we can see through them. Some objects let only some light pass through them and such types of objects are called translucent objects. This means that light cannot pass through translucent objects.
So, from the given objects. A glass strip, an ordinary paper, greased paper, tracing paper, polythene sheet, wooden piece, steel plate, glycerin, kerosene oil, mustard oil, grounded glass, stone, book, water and milk. We can differentiate the following categories as:
Opaque materials: Stone, book, an ordinary paper, wooden piece, steel plate and milk.
Transparent materials: A glass strip, water and kerosene oil.
Translucent materials: Greased paper, tracing paper, polythene sheet, glycerin, mustard oil and grounded glass.

Note: Both transparent and translucent objects will allow light to pass through them. A significant part of the incoming light is transmitted by transparent objects. The light is hardly scattered or reflected. As transparent objects do not reflect light, they appear to be colorless. Translucent materials form blurred images of the objects that are seen through them.