CLASS 5 · LEARNING KNOWLEDGE
Shadows and visibility – basic principles
How it works
Shadows arise when light from a light source is prevented completely or partially from reaching an object. Opaque objects produce clear shadows, translucent objects often produce light and blurry shadows, transparent objects usually only very weak shadows. An object is visible when light from it reaches our eye – either because it emits light itself or because it is illuminated and reflects light. Light travels in straight lines, which is crucial for the formation of shadows.
Note
A shadow is formed when an object stands between a light source and a surface and blocks the light completely or partially. Light travels in straight lines. An object is visible when light from it reaches our eye.
A shadow is formed when an object stands between a light source and a surface and blocks the light completely or partially. Light travels in straight lines. An object is visible when light from it reaches our eye.
An example
What condition must be met for a clear shadow to form on a wall?
A clear shadow forms when an opaque object stands between the light source and the wall. Reason: It blocks the light almost completely. Translucent or transparent objects produce at most a weaker or less sharp shadow.
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50 Exercises
To the learning unit →Own explanation and own practice exercises by AmyMath. Subject reference framework: Physics. The topic assignment may vary by federal state.