The unit for illuminance is the lux (lx). Lux is defined as one lumen per square meter. It is used to measure the amount of light that falls on a surface, indicating the brightness or intensity of light at that point. Lux is commonly used in lighting design, photography, and other applications where the level of light is important. **

Hobbies that involve being outdoors in nature include hiking, birdwatching, gardening, camping, fishing, and photography. These activities allow individuals to connect with the natural world, breathe in fresh air, and enjoy the beauty of the outdoors. Engaging in these hobbies can also provide physical and mental health benefits, such as reducing stress and increasing physical activity. **

A suitable camera for nature and wildlife photography would be a DSLR or mirrorless camera with a high resolution sensor (20+ megapixels) for capturing fine details, a fast and accurate autofocus system for capturing moving subjects, and a weather-sealed body to withstand outdoor conditions. Additionally, a camera with a good burst rate for capturing fast-moving wildlife and a long battery life for extended shooting sessions would be beneficial. Some popular options for nature and wildlife photography include the Canon EOS 90D, Nikon D850, and Sony A7R IV. **

People who work as field biologists, ecologists, environmental scientists, geologists, or botanists often conduct research outdoors in nature. These professionals study various aspects of the natural world, such as wildlife, ecosystems, geological formations, or plant life, by collecting data and observations directly from the field. Conducting research outdoors allows them to study the environment in its natural state and gain a deeper understanding of the interactions between living organisms and their surroundings. **

Some people may not like being outdoors in nature due to a fear of insects or animals, discomfort with unpredictable weather conditions, or a preference for indoor activities. Others may have physical limitations that make it difficult to navigate outdoor terrain or may simply feel more at ease in urban environments. Additionally, some individuals may have had negative past experiences in nature that have influenced their perception of outdoor spaces. **

I conduct research outdoors in nature as a field biologist. This profession involves studying various aspects of plants, animals, and ecosystems in their natural habitats. Field biologists often spend extended periods of time in the field, collecting data, observing behaviors, and conducting experiments to better understand the natural world. This hands-on approach to research allows for a deeper appreciation and insight into the complexities of the environment. **

The illuminance of a surface decreases by a quarter of its value when the distance to the light source is doubled because of the inverse square law. This law states that the intensity of light at a point is inversely proportional to the square of the distance from the source. When the distance is doubled, the light is spread out over four times the area, resulting in a decrease in illuminance by a factor of four. This is why the illuminance decreases by a quarter of its value when the distance to the light source is doubled. **

To calculate the illuminance at a different distance from the light source, you can use the inverse square law. This law states that the illuminance is inversely proportional to the square of the distance from the light source. So, if the illuminance is given at one meter, you can calculate the illuminance at a different distance by using the formula: E2 = E1 * (d1/d2)^2, where E1 is the illuminance at one meter, d1 is the distance at which E1 is measured, E2 is the illuminance at a different distance, and d2 is the distance at which E2 is to be calculated. **