Shadows and Penumbra
This experiment investigates the formation of shadows using different shadow rods. Light does not bend around the object, so a shadow of the same shape is cast on the screen.
Lo que aprenden los alumnos
- Shadows are produced because light travels in straight lines
- A larger image is produced from a point source, due to diverging light rays from the single bulb
- Using the projecting lamp, which has a bulb at its focus and so gives a collimated beam, the shadow produced is similar in size to the object
La base científica de este experimento
Shadows, umbra and penumbra. Shadows are formed when an object blocks the path of light. The shadow is the space behind the object where no light falls. Shadows have a shape similar to that of the object that produces them. We can get two types of shadows. A completely shaded area is known as umbra, whereas a partially shaded area is called penumbra.
A clear, distinct shadow is formed when the light source is smaller than the object so that all of the light is blocked.
Equipo utilizado
- Inclined plane, with 3 different trackterminals — 5491.11
- Projector with 12V 20W halogen lamp — 4414.18
- Slider for projector — 4417.17
- Slider for holder — 4417.01
- White metal screen — 4418.35
Productos químicos y reactivos
Notas de seguridad
Preguntas para los alumnos
- Why does the single bulb produce a larger shadow?
- Why does the projecting lamp produce a shadow similar in size to the object?
- Why is the shadow the same shape as the object?
- What is a solar eclipse?
Qué puedes esperar
Eliminación
Realiza este experimento en tu clase
Este experimento forma parte del « Mobile Lab » de ATP, un laboratorio autónomo que convierte un aula normal en un laboratorio de ciencias en pleno funcionamiento, con más de 200 experimentos de física, química, biología, robótica e ingeniería. « Gali », el tutor de IA integrado en ATP Connect, guía a los alumnos paso a paso y responde a sus preguntas en la mesa de trabajo.
Consulta el Mobile LabHabla con nuestro equipo