Questions: 1. While holding the pencils close to your one eye and looking to the light source you can notice that there is a line perpendicular to the slit. What will happen position of line of the light if you rotate the pencil to vertical? 2. What happen to the blob of light if you squeeze the slit together? 3. Notice that the blob has blue and red edges, which of two colours is closer to the light source? What can you say about their wavelengths