When you use artificial lighting, you may be unhappy with the effects of different types of bulb. The variety of light of unique wavelengths are not the same as sunlight which gives us a continous range of colours. In order to investigate the wavelengths of light , a narrow beam is made to pass through diffraction grating that has the ability to split them and direct the different wavelengths to different angles so that they become visible. Imagine if you were to eat something really tasty, how could you find out what goes in it. With diffraction grating, we can solve the mystery as to what the light is made up of. To our suprise a seemingly "blue" light has a tinge of red or green or violet or many shades of blue.Using the formula dsin(teta)= n(lamda) . Consider n=1 , different wavelengths can be viewed at different angles. You can look through a light spectrometer in your lab to investigate the ingredients of light from different types of bulb.
