Lights and Shadows

Light Shadows and Reflection

By Mishka Malhotra

Open Ended

What is Light

What is Light

Better Way of understanding

Light is a type of energy. It is a form of electromagnetic radiation of a wavelength that can be detected by the human eye. It is a small part of the electromagnetic spectrum and radiation given off by stars like the sun. ... Light exists in tiny energy packets called photons.

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Quick summary of the Chapter ​

• All the opaque objects seem to form a dark shadow of their own.

• We need a source of light, an opaque object in the way, and a screen to see a shadow.

• Screen: This is a surface on which the shadow is formed. It may be a butter paper or simply ground.

• Shadows give us some information about shapes of objects.

• The colour of the opaque object does not affect the colour of the shadow.

• All the space behind the opaque object, up to some distance behind it seems to be filled with the shadow.

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Some More information

An image formed by a pinhole camera images formed by a pinhole camera is upside down. Here is a picture showing the path of rays of light coming from an object far away to a pinhole and then to the screen. When sunlight passes through the leaves of a tree, the gaps between the leaves act as pinholes. These natural pinholes cast nice round images of the sun.

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Rectilinear propagation: Light travels in a straight line. It is called rectilinear propagation of light.

Image formation by a plane mirror: We are able to see images through a mirror. The image formed by a mirror (flat) has the following features:

• Reflected image retains the color of the object.

• Image is erect but laterally inverted.

Lateral inversion: Right side of the object appears as the left side in the image formed by a plane mirror. For example, if we show our right hand, an image in the mirror will show as our left hand. In a mirror, if you see another person, surely the other person can also see you in that mirror.

Luminous: Objects that give out or emit light of their own are called luminous objects.

Mirror: A smooth shining surface, which rebounds the light back in the same or in different directions is called a mirror.

​Ready for a Quiz

Fill in the Blanks

Multiple Choice

Which letters of English alphabet will not show lateral inversion?

• I, O, U

• N, Z, X

• I, X, E

• A, E, I

Multiple Choice

Opaque objects cast …………………. shadows in morning and evening while ………………… shadows at noon.

• Big, Small

• Small , Big

• Short

• Large

Multiple Choice

Light gets reflected when strikes a shiny surface.

• True

• False

Open Ended

In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?

Draw

What comes in your mind when you think of the word light , Reflection and shadow

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