An image of object O is formed by a plane mirror. A person views the image. Figure 6.1 shows a scale diagram of the arrangement. Mark the position of the image. Label it I.

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6(a)(ii)Reflection MirrorsEasy2 marks

Draw on Figure 6.1 to show the path of the light from object O to the person’s eye.

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6(b)(i)Refraction Total Internal ReflectionEasy2 marks

Figure 6.2 shows three rays of light travelling from a light source S. The rays travel in glass towards a glass–water boundary.

Figure 6.2, three rays of light from a source S travelling up through glass to a horizontal glass-water boundary, with angles of 25 degrees and 28 degrees marked to normals at the boundary and the shallowest ray labelled ray X; marked NOT TO SCALE

Calculate the refractive index for the glass–water boundary. Use information from Figure 6.2.

6(b)(ii)Refraction Total Internal ReflectionEasy1 mark

On Figure 6.2, label the critical angle c.

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6(b)(iii)Refraction Total Internal ReflectionEasy1 mark

On Figure 6.2, continue the path of ray X after it reaches the glass–water boundary.

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