"Colour Shadows" - by Young Scientist "L. Karthik"
5. Observations you want your students to make/Questions to answer
1.Why shadows are formed of different colours?
2.When you switch off one of the lights,why do some colour
shadows go missing?
6. Conclusion - (Cloze passage with the KEY CONCEPT like in your workbook)
Red,Green and Blue through combination make
white colour. As light travels in straight lines,the
shadow formed by blocking all three colours at the
same place from black shadows.
In the areas,where Red light is blocked,Green and Blue light
combine to make cyan. Where,blue is blocked,Red and Green light combine to make yellow and so forth.
Any other interesting videos/pictures
2. Aim
To check whether shadows are only black in colour or other
colour shadows can be formed.
3. Materials
1. White Board
2. Red,Green and Blue bulbs
3. 3 light sockets
4. An opaque object like hand etc
5. An adult help
4. Procedure/Steps (+ Diagrams)
1.Set-up the bulbs and white board such that light
from all the bulbs fall on the same place.
2. Arrange the bulbs in Red-Blue-Green.
3. Make the room dark.
4.Turn on the colour lights and adjust their positions
until white light is seen on the board.
5.Place opaque object close to the board.
6.Look for different colours of shadows formed.
7.Now,switch off one of the lights and observe the colours
of shadow formed.
8.Repeat the previous step, by switching off another light.
9.Try the experiment using different opaque object.