CBSE & NCERT Solutions For Class 6 Science Light Shadows Chapter 11
Class 6 Science Light Shadows Chapter 11
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Light and Shadow
Light: Light is a form of energy which helps us in seeing objects. When light falls on an object, part of the light gets reflected. The reflected light enters our eyes and we are able to see an object. Light always travels in a straight line, and its rays represent the path of light objects.
Luminous Object: An object which emits light on their own is called a luminous object. The light produced by luminous objects enables us to see things around us. Examples of luminous objects are the Sun, bulb, tube light, a lit candle, a bonfire and a lit torch.
Non-luminous object: An object which does not emit light on their own is called non-luminous object, the light emitted by luminous objects falls on non-luminous objects, and then bounces back to our eye, which enables us to see non-luminous objects. Examples of non-luminous objects are the moon, a cupboard, a pen, a book, a wooden box, and the chair.
Transparent Object: An object which allows seeing anything clearly through an object means a complete passage of light is called a transparent object. A medium that allows all the light incident on it pass through it is called a transparent medium. Examples of transparent objects are plain glass, a plastic scale, window panes, a soap bubble, a reading glass, and pure water.
Translucent Object: An object that allows only a part of the light (partial passage of light)incident for them to pass through it is called a translucent object. We can see through a translucent object, but the vision would be faint. Examples of translucent media are a Sun glasses, shower stall, smoked glass, and butter paper.
Opaque Object: An object through which we cannot see (does not allow passage of light) is called an opaque object. A medium through which the light does not pass is called an opaque medium. Examples of opaque are a pencil box, a book, a towel, a wooden screen, a ceramic plate and chart paper.
Formation of Shadow
When light falls on an opaque object, a dark spot draws on the other side of the object; if a screen is present on the other side. Three things are required for formation of shadow means an opaque object blocking the path of the light, viz., a source of light, an object, and a screen.
Features
- The size of the shadow relies on the distance of the source of light and on the angle from where the light rays fall on the object.
- If the source of light is closer to the object, a larger shadow is formed than when the source of light is far from the object.
- If the angle of incident light is smaller, the shadow is longer. On the other hand, if the angle of incident light is bigger, the shadow is smaller. This explains, why our shadows are longer in the morning and evening and smaller in the noon.
Most objects in our surroundings, like buildings and trees, are opaque objects. For example, during a lunar eclipse, we see a part of the earth’s shadow on the surface of the moon. This happens when the earth, the sun, and the moon are in a straight line, with the earth between the sun and the moon.
Here, the sun acts as the light source, the earth as the opaque object, and the moon as the screen. In the olden days, shadows caused by objects installed in the sun were used to measure time.
Such a device is called a sundial. The Jantar Mantar in Jaipur consists of a sundial or Samrat Yantra, which can be used to tell the time, as its shadow moves visibly at one millimeter per second, or roughly six centimeters every minute.
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