Red, green and violet lights are part of the visible spectrum of light. What is the order of colours from shortest to longest wavelength?

3.2.1.1 Describe the formation of an optical image by a plane mirror, and give its characteristics

3.2.1.2 Recall and use the law angle of incidence = angle of reflection

3.2.1.3 Recall that the image in a plane mirror is virtual

3.2.1.4 Perform simple constructions, measurements and calculations for reflection by plane mirrors

3.2.2.1 Describe an experimental demonstration of the refraction of light

3.2.2.2 Use the terminology for the angle of incidence i and angle of refraction r and describe the passage of light through parallel-sided transparent material

3.2.2.3 Give the meaning of critical angle

3.2.2.4 Describe internal and total internal reflection

3.2.2.5 Recall and use the definition of refractive index n in terms of speed

3.2.2.6 Recall and use the equation sin⁡i/sin⁡r =n

3.2.2.7 Recall and use n=1/sin⁡c

3.2.2.8 Describe and explain the action of optical fibres particularly in medicine and communications technology

3.2.3.1 Describe the action of a thin converging lens on a beam of light

3.2.3.2 Use the terms principal focus and focal length

3.2.3.3 Draw ray diagrams for the formation of a real image by a single lens

3.2.3.4 Describe the nature of an image using the terms enlarged/same size/diminished and upright/ inverted

3.2.3.5 Draw and use ray diagrams for the formation of a virtual image by a single lens

3.2.3.6 Use and describe the use of a single lens as a magnifying glass

3.2.3.7 Show understanding of the terms real image and virtual image

3.2.4.1 Give a qualitative account of the dispersion of light as shown by the action on light of a glass prism including the seven colours of the spectrum in their correct order

3.2.4.2 Recall that light of a single frequency is described as monochromatic

3.3.1 Describe the main features of the electromagnetic spectrum in order of wavelength

3.3.2 State that all electromagnetic waves travel with the same high speed in a vacuum

3.3.3.1 radio and television communications (radio waves)

3.3.3.2 satellite television and telephones (microwaves)

3.3.3.3 electrical appliances, remote controllers for televisions and intruder alarms (infrared)

3.3.3.4 medicine and security (X-rays)

3.3.4 Demonstrate an awareness of safety issues regarding the use of microwaves and X-rays

3.3.5 State that the speed of electromagnetic waves in a vacuum