A periscope works on the Laws of Reflection which states that the light from the object falls on one mirror at a 450 angle from the object and is reflected. This reflected light then falls on another mirror and is again reflected until it reaches the human eye.
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transparent
If we are able to see clearly through an object, it is said to be transparent
translucent
If we are able to see not clearly through an object, it is said to be translucent
opaque
If we cannot see through an object at all, it is an opaque object
luminous
A body which emits light by itself
non-luminous
A body which does not emits light by itself
Moon is a non-luminous body, it does not emit its own light. It reflects the sun light that falls on it.
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