Sunlight contains radiant energy. A solar cooker is specifically designed to capture and convert this sunlight into heat energy through absorption and concentration. It uses reflective surfaces (like mirrors) to focus sunlight onto a cooking vessel, where dark surfaces absorb the light and convert it into thermal energy (heat) to cook food.

Solar cells (photovoltaic cells) convert sunlight directly into electrical energy, not heat. LPG and petroleum are fossil fuels that release heat energy through combustion (chemical reaction), not by directly converting sunlight.

Final Answer: Solar cooker