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Why Do Convex Lense To Start A Fire

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You want to use a convex lense to start a fire because when light is being refracted through a concave lense it tends to diverge the light, so it basically separates the refracted light and makes them go in different directions without joining together. On the other hand, when you shine light through a convex lense the light converges and focuses in one spot. In other words, the refracted light is not parallel when it shines through a convex lense. Therefore, you would need to use a convex lense in order to make a fire because it can shine the light directly at the object . A concave normal points towards the middle and the convex normal points away from the middle. If the light shines at a concave lense, the light being refracted

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