Experience the energy of sunlight. As soon as the sunlight encounters resistance or impermeability, it is converted into warmth which we notice on our skin, for example.Sunlight is collected in the 30 cm magnifying lens and is concentrated to a beam. The rougher and darker the material that it encounters, the more the rays are converted to heat. This can be experienced by carefully placing the hand behind the lens. Even wood can be scorched at the focal point.