Question
What makes things visible to us? Why cannot we see a book which is placed.
(a) Behind a wooden screen, and (b) In a dark room?

Answer

Light makes things visible to us. We see an object when light passing through it is reflected. We cannot see a book which is placed.
  1. Behind a wooden screen because the wooden screen is opaque so it does not allow light to pass through it.
  2. In a dark room because there is no light to be reflected by the book. Thus, due to no reflection, the book is not visible.

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