REFLECTION OF LIGHT WAVES

Light is a form of energy called Luminous energy. This energy causes a sensation of vision, enabling us to see.

Light can also be defined as the visible part of the electromagnetic waves.

Additional information about light wave (supply it)

Natural sources: Sun, starts, fireflies and some deep sea fish

Artificial sources: Candles. Electric touch, electric lamp, incandescent lamp, fluorescent tubes etc.

Luminous object: This is a object either natural or artificial which produces or generate light of its own e.g. Sun, stars, electric lamps e.t.c

NON LUMINOUS OBJECT

These are the objects that you see because the sun or other light bounce off their surfaces. They reflect into your eyes e,g. tables, chairs, books etc.

Opaque Object:

Translucent object:

Transparent object:

A light ray is the direction or path along which light energy flows. Diagramatically,rays are lines with arrows on them. They are produced in the laboratory by means of a ray box

SHADOW

ECLIPSE

PINHOLE CAMERA

MAGNIFICATION (M) = Size of image

   Size of object.

M= height of the image

height of object

= distance of image from pinhole

distance of object from pinhole

= Length of camera

Distance of object from pinhole

An object 20cm high is 30cm from the hole of a pinhole camera, if the height of the image is 15m, what is the distance of the image from the pinhole.

Object size = 20cm

Object height =15cm

Image height = 15cm

Distance of image from pinhole =?

Distance of object from pinhole = 30cm

Image height = distance of image from pinhole

Object height = distance of object from pinhole

 15 = V

20 30

v= 15 x 30

20

=22.5cm.