Explain why partial shade also occurs when an object is illuminated with two or more point light sources.

The light on the screen does not come from every light source, but only from their parts. Part of the screen surface will be completely unlit – the center area of the screen. There is a complete shadow here.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.