JSS 2: Light energy (II)

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                               Shadow 
A shadow is an area in which light rays from a source cannot reach 
                         Types of shadow 
There are two types of shadow:
1. Umbra: A region of complete darkness
2. Penumbra: A region of partial darkness 
                                 Eclipse 
An eclipse is a result of a shadow cast by one heavenly body on another 
                        Types of eclipse 
There are two types of eclipse, namely:
1. Eclipse of the sun (Solar eclipse)
2. Eclipse of the moon (Lunar eclipse)
                       Solar eclipse 
Solar eclipse occurs when the moon comes between the sun and the earth 

                        Lunar eclipse 
A lunar eclipse occurs when the earth comes between the sun and the moon
                          Image 
An image is a visual representation of an object.
                   Types of image 
The two types of images are:
1. Real image: A real image is an image that can be formed on a screen
2. Virtual image: A virtual image is an image that cannot be formed on a screen 
Characteristics of the image formed by a plane mirror 
1. It is virtual 
2. It is upright 
3. It is laterally inverted 
4. It is the same size as the object
5. It is as far behind the mirror as the object is in front of the mirror

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