Students can go through AP State Board 6th Class Science Notes Chapter 11 Shadows – Images to understand and remember the concept easily.
AP State Board Syllabus 6th Class Science Notes Chapter 11 Shadows – Images
→ We need light to see objects.
→ A substance that gives light is known as a source of light.
→ Shadows are formed when opaque objects obstruct the path of light.
→ In addition to light and object, we also need a screen to obtain the shadow of an opaque object.
→ The color of objects cannot be determined by looking at their shadows.
→ Light travels in a straight line.
→ Light gets reflected when it falls on any object.
→ People came to an understanding that light travels in a straight line by observing the shapes of shadows.
→ An image is different from a shadow.
→ Light: Light is an energy source that responsible for sight.
→ Sources of light: A substance that gives light is known as a light source.
→ Shadow: A shadow is a dark area where light from a light source is blocked by an opaque object.
→ Transparent substances: The substances like glass and ajr allow light to pass through them and hence we don’t get their shadows. Such substances are called transparent.
→ Translucent substances: The substances such as polyethylene cover and oily paper partially allows the light to pass through them. Their shadows are unclear. These are called translucent.
→ Opaque substances: The substances that don’t allow light to pass through them are called opaque substances.
→ Pinhole camera: A pinhole camera is a simple camera without a lens hut with a tiny aperture.
→ Image: An optical appearìnce produced by light from an object reflected in a mirror or refracted through a lens.
→ Reflection: The return of light or sound waves from a surface.
→ Shadow puppetry is one of our traditional recreational activities. In this. some puppets arc used to form shadows on a screen and a story is narrated with the help of these shadows. Observe
Figure Try to make puppets and do a shadow puppet show in your school.