Why can’t we see through opaque objects?

Why can’t we see through opaque objects? What is the reason? (Kavya asked) Answer: When light falls on an object, a part of it is absorbed, another part transmitted and the rest reflected. Surfaces have different abilities for these. Substances which do not transmit any light are opaque. Incoming search terms:what are the possibilities of [...]

Why does magnet attract only some of the materials like iron why not plastic ? What is the absolute reason behind it?

Why does magnet attract only some of the materials like iron why not plastic ? What is the absolute reason behind it? (Ankit Gururani posted in facebook) Answer: The answer cannot be limited to a quick reply. The cause of magnetism is revolution of electrons. A revolving electron acts like a tiny magnet just like a [...]

you are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.?

You are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.? Asked Merlin Mary Mathew Answer: If the wires are connected one by one to a source, (or connected in parallel to the same source) the one having less resistance (Greater thickness) will get heated up first. [...]