LIGHT, SHADOWS AND REFLECTIONS

LIGHT, SHADOWS AND REFLECTIONS

• Light: Light is the natural agent that stimulates sight and makes things visible.
• Light is classified into two:
(i) Emission of light: Classifying objects on the basis of emission of light.
(a) Luminous Objects: Objects that emit their own light. Example: sun, electric torch, firefly, etc.
(b) Non-luminous Objects: Objects that do not emit their own light but are visible due to light falling on them. Example: moon, chair, table, etc.
• Transparent: Objects or materials through which light can pass totally.
Example: glass, water, air, etc.
• Translucent: Objects that allow light to pass through them partially. Example: butter paper, tissue paper, etc.
• Opaque: Objects that do not allow light to pass through them. Example: book, brick, etc.
Shadow: Region without light that forms behing an object kept in the path of light. Opaque object cast a dark shadow. Translucent objects produce a weak shadow. Transparent objects do not cast a shadow at all.
Types of shadow:
Due to smaller light source: Only one dark shadow is formed and this is known as umbra.
Due to larger light source: Two shadows are formed-a dark one in the centre and a light one on the outside. Dark shadow is called umbra and the faint or
lighter shadow is called penumbra.
Eclipse: A shadow formed in space that makes the sun or the moon invisible for
some time.
Solar eclipse: The moon comes between the sun and the earth, so that the earth (in the shadow) darkens during the day.
Lunar eclipse: The moon and the sun are in a straight line such that the earth is in the between the sun and the moon, the shadow of the earth falls on moon and the moon cannot be seen.

(ii) Reflection of light: The process of sending back the light rays whichafall on the surface of an object. Silver metal is one of the best reflector of light.

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