A student directs a beam of white light from a filament lamp towards a glass prism in a dark room. Fig. 4.1 shows the beam of white light incident on the left-hand side of the glass prism. [Figure 4.1]

1. (a)Draw on Fig. 4.1 to show the paths of the red light and the violet light between the left-hand side of the prism and the screen at point R and point V.[2]
2. (b)State what these observations show about the change in speed of red light and change in speed of violet light as each enters the glass from the air.[2]
3. (c)Five other colours of light appear on the screen between the red light at point R and the violet light at point V.
4. (c)(i)State the names of the five colours and list them in the correct order from red to violet. red ................................................................................................................................................................................................. violet [2][2]
5. (c)(ii)State how the frequency and the wavelength of the coloured light change going from red light to violet light. frequency .......................................................................................................................................................................................... wavelength ...................................................................................................................................................................................... [1][1]
6. (d)On Fig. 4.1, point P is shown immediately next to point R. No light is observed at point P, but a detector at point P registers radiation reaching the detector. State which region of the electromagnetic spectrum is detected at point P.[1]

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