Question

what makes things visible to us ?whycannot we see a book which is placed(a)behind a wooden screen,and(b)in a dark room

Answer 1

We can see the things when the light from the object reflects and enter through our eyes
a)we cannot see cause wooden screen is a solid that will not pass light throgh it it will reflect away into digferent parts.

b) Light is essential in order to see things..


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Answer 2

because a book is not transparent but it is opaque object we can't see anything from opaque object we can see things from transparent object.