The torch bulb is an object that gives out light of its own. The Sun, is another familiar object that gives its own light. During the day, its light allows us to see objects. Objects like the sun that give out or emit light of their own are called luminous objects.
If we cannot see through an object at all, it is an opaque object. If you are able to see clearly through an object, it is allowing light to pass through it and is transparent.
There are some objects through which we can see, but not very clearly. Such objects are known as translucent.
The dark patch formed by each on the ground is due to its shadow. Sometimes wou can identify the object by looking at its shadow.
The shadow can be seen only on a screen. The ground, walls of a room, a building, or other such surfaces act as a screen for the shadows you observe in everyday life.
Shadows give us some information about shapes of objects.
The pinhole camera look through the open face of the smaller box.
Never ever look directly at the Sun. That could be extremely harmful for the eyes.
While we look into the mirror and see your own face inside the mirror it's known as reflection of your face in the mirror. Reflections of other objects that are in front of the mirror.