Illuminated objects or non-luminous objects are the objects that shine in the light of other objects and are capable of reflecting light to our eyes. Non-luminous objects cannot produce light of their own. Normally we see the object due to reflection of light. Moon for example receives light from the sun and reflects it. That is how we see the moon. Non - luminous objects cannot produce light of their own.
Image showing the moon
Video on illuminated object
Some of the learners also asked: What will happen if parallel rays fall at an irregular surface?