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(a) The Direct Method
Deal with the individual and measure objective criteria.
- Anthropometric methods
- Biochemical and laboratory methods
- Clinical methods
- Dietary evaluation methods
The Indirect Method
Uses Community health indices that reflects nutritional influences.
- Ecological variables including crop production.
- Economic factors e.g. per capita income, population density and social habits.
- Vital health statics particularly infant under 5 mortality and fertility index.
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According to the Cartesian sign convention, the focal length should be positive since the convex mirror forms a virtual image to the right of mirror (positive direction) when light comes from left.
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