Colour of lightIB MYP Physics: Flashcards

Exam questions on Colour of light

1. A student shines a narrow beam of white light through a glass prism in a darkened room. A band of different colours appears on a white screen on the other side of the prism, with red at one end and violet at the other.
   Explain why the prism splits the white light into different colours.2 marks
2. A theatre lighting technician is setting up spotlights on a white screen. She has three spotlights that shine pure red, pure green and pure blue light. She also has a magenta filter, which she can place in front of a spotlight that gives white light.
   Describe what happens to red, green and blue light when white light passes through the magenta filter.2 marks
3. A student investigates how objects look under different coloured lights in a dark room. She uses lamps that give pure red, pure green and pure blue light, and three objects: a white sheet of paper, a red apple and a blue book. Under green light, the white sheet looked green and the red apple looked black. Under red light, the white sheet looked red and the blue book looked black.
   Identify the independent variable, the dependent variable and one control variable in this investigation.3 marks