 I have a small laser light with me and I'm shining it on the wall. Now in this activity, we will see that light actually travels in a straight line. And for this activity, you need a laser light, you can have some incense cones. Even if you do not have incense cones, which is actually called Dhoopatti. Even if you do not have that, a pair of dusters will work as well. Now to begin with, I will light them up and I will arrange them in a straight line. Just, just like this. And now when I shine the laser light on top of it, just see what happens. You can identify, you can locate the light at all of these locations, right? As it is travelling through the smoke. And this tells us that light actually travels in a straight line. As the light interacts with the smoke, we can clearly see the path taken by the light, which is actually a straight line. You must have also seen light coming in through a window and you could have seen the path of the sunlight that enters your room. From that observation, you can also say that light travels in a straight line. And we can see that sunlight because there is a lot of dust and some smoke in our surroundings. That is how we can actually see the path of the light.