( (a) (i) Identify the structure in the diagram
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[ 1 mark ]
(ii) Name the parts labeled I to X
I. ………………………………………………………… VI. ……………………………………………………………..
II. …………………………………………………………. VII. …………………………………………………………….
III. ………………………………………………………… VIII. ……………………………………………………………
IV. ……………………………………………………….. IX. ……………………………………………………………
V. ………………………………………………………. X. …………………………………………………………….
[ 5 marks ]
(iii) State the function of the parts labeled II, III, V, VII and IX
II. …………………………………………………….. VII. …………………………………………………………..
III. ……………………………………………………. IX. ……………………………………………………………
V. ……………………………………………………. [ 5 marks ]
(b) What happens to the part labeled VIII in:
(i) Bright light:……………………………………………………………………………………………………………..
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(ii) Dim light:……………………………………………………………………………………………………………….
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(c) (i) List four defects associated with the structure in the diagram.
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[ 4 marks ]
(ii) State ways in which each of the defects in 2(c)(i) above can be corrected
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[ 4 marks]
(d) Outline four ways by which the structure in the diagram can be taken care of.
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[ 4 marks ]