Light rays, opaque objects, umbra and penumbra regions | Light | Physics

Описание: Using a small light source such as an incandescent bulb, shadows are seen to be sharply defined. The outline of the shadow is sharp and there is stark contrast between the lit and unlit areas. Using a diffused light source such as a CFL lamp changes the nature of the shadow and there is area of half-light, half-shadow. The region of complete shadow is called the umbra and the region of diffuse shadow is called the penumbra. These shadows are formed on the Earth during a solar eclipse and From the umbra we see a total eclipse while from the penumbra only a partial eclipse is visible.