1. (i) On Fig. 5.1, draw a ray from the top of the object that passes through a principal focus, then through the lens and beyond it.

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(ii) On Fig. 5.1, draw a second ray from the top of the object that passes through the centre of the lens. Continue the path of this ray to the edge of the grid.

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(iii) On Fig. 5.1, draw an arrow to show the position and nature of the image produced by the lens.

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