1 00:00:00,370 --> 00:00:04,589 What is light? 2 00:00:05,150 --> 00:00:10,070 The light is a form of energy produced by a luminous object. 3 00:00:14,300 --> 00:00:15,460 The light can be 4 00:00:15,460 --> 00:00:20,339 Natural. It doesn't need electricity to produce it. 5 00:00:20,719 --> 00:00:22,500 Example, sunlight. 6 00:00:23,399 --> 00:00:28,640 Artificial. It needs energy or electricity to produce it. 7 00:00:28,640 --> 00:00:30,960 For example, light bulb. 8 00:00:30,960 --> 00:00:35,960 The light affects the things in different ways. 9 00:00:35,960 --> 00:00:42,960 A transparent material. It lets other light pass through, for example, a window. 10 00:00:42,960 --> 00:00:57,960 A translucent material. You can't see what is in the other side perfectly, but it lets the light go through, for example, plastic. 11 00:00:57,960 --> 00:01:09,650 An opaque material. You can see what is the other side and it doesn't let the light go through. Example, walls. 12 00:01:11,090 --> 00:01:12,810 Thank you. Bye.