Red-hot iron rod is _____ and _____.

The correct answer is: Opaque, non-luminous

• Transparent Objects: If you are able to see clearly through an object, it is allowing light to pass through it and is transparent. For example: water, clear glass etc.
• Opaque Objects: If we cannot see through an object at all, it is an opaque object. For example: wooden door, wall etc.
• Translucent Objects: There are some objects through which we can see, but not very clearly. Such objects are known as translucent. For example: Butter paper, ground glass etc.
• Luminous objects are those which emit light on their own.
• Examples: - Sun, flame of a burning candle
• Non-luminous objects are those which can not emit light on their own. These objects reflect light from luminous bodies.
• Examples: - Moon, Earth

• Since light cannot pass through red hot iron so its an opaque object and it emits its own light so its a luminous object.