Light travels in a straight line and can be reflected off objects. There are three types of objects: transparent objects that light can pass through clearly, translucent objects that light can pass through faintly, and opaque objects that block light. A shadow is formed when an opaque object blocks light from a source to a screen. The size of a shadow depends on the distance and angle of the light source. Reflection occurs when light bounces off a shiny surface like a mirror.

1. VIDYA BHARTI EDUCATIONAL INSTITUTIONS
SCIENCE NOTES CLASS 6TH
LIGHT, SHADOW AND REFLECTION
Light: Light is a form of energy which helps us in seeing objects. When light
falls on an object, some of the light gets reflected. The reflected light comes to
our eyes and we are able to see an object.
Luminous Object: An object which produces light is called a luminous object,
e.g. sun, bulb, etc.
Non-luminous object: An object which does not produce light is called non-
luminous object, e.g. moon.
Propagation of Light
Light always travels in a straight line. This can be proved by a simple
experiment. For this, take a cylindrical tube; which can be easily bent. Try to
see a source of light; like a bulb or a candle; through the straight tube. Once
the tube is bent at some angle, it is not possible to see the source of light
through it. This happens because light travels in a straight line.
Transparent Object: An object which allows complete passage to light is called
a transparent object. We can clearly see through a transparent object.
Translucent Object: An object which allows partial passage to light is called a
translucent object. We can see through a translucent object but the vision
would be faint.
Opaque Object: An object which does not allows passage to light is called an
opaque object. We cannot see through an opaque object.
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2. VIDYA BHARTI EDUCATIONAL INSTITUTIONS
SCIENCE NOTES CLASS 6TH
LIGHT, SHADOW AND REFLECTION
Formation of Shadow
When light falls on an opaque object, a dark patch is formed on the other side
of the object; if a screen is present on the other side. Three things are
required for formation of shadow, viz. a source of light, an object and a
screen.
The size of shadow depends on the distance of source of light and on the
angle at which 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.
Structure of a pinhole camera:
A pinhole camera is simple device. One can get an inverted and real image in
a pinhole camera.
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3. VIDYA BHARTI EDUCATIONAL INSTITUTIONS
SCIENCE NOTES CLASS 6TH
LIGHT, SHADOW AND REFLECTION
A pinhole camera is composed of two boxes. One of the boxes snugly fits
inside another box and can be slid to and fro. There is a pin-sized hole at the
front of the camera and a translucent screen at the back of the camera. The
distance between the pin-hole and screen can be adjusted to obtain a clear
image of an object.
Mirror and Reflection:
When light falls on a shiny surface, the light rays bounce back. This
phenomenon is called reflection of light. Mirror is a surface from which most of
the incident light gets reflected.
CONTACT: 9654089891, 9811083910, 9953898004
HEAD OFFICE: 131/12 KRISHNA COLONY, STREET NO 4, NEAR SHIV MANDIR, GURGAON