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8.1 Define the term dispersion - NSC Technical Sciences - Question 8 - 2020 - Paper 2
Question 8
8.1 Define the term dispersion. 8.2 Name any FOUR colours in visible light. 8.3 State THREE properties of the image formed in a plane mirror. 8.4 Redraw the diagr... show full transcript
Worked Solution & Example Answer:8.1 Define the term dispersion - NSC Technical Sciences - Question 8 - 2020 - Paper 2
Step 1
Define the term dispersion.
Answer
Dispersion is the phenomenon whereby white light breaks up (or spreads out) into its component colours. This process occurs because different wavelengths of light refract at different angles when passing through a medium, leading to a separation of colors.
Step 2
Step 3
State THREE properties of the image formed in a plane mirror.
Answer
- The image is always virtual, meaning it cannot be captured on a screen.
- The image is erect, maintaining the same orientation as the object.
- The size of the image is equal to the size of the object, and it is laterally inverted, which means the left and right sides are swapped.
Step 4
Redraw the diagrams below in the ANSWER BOOK and complete EACH to show the path of the ray after passing through the lens - 8.4.1
Answer
In diagram 8.4.1, draw a dotted line extending the ray passing through the optical center of the lens, showing that it continues in a straight line without deviation.
Step 5
Redraw the diagrams below in the ANSWER BOOK and complete EACH to show the path of the ray after passing through the lens - 8.4.2
Answer
In diagram 8.4.2, draw a line parallel to the principal axis on the opposite side of the lens, indicating that it diverges from the focal point on the same side as the incoming ray.
Step 6
Redraw the diagrams below in the ANSWER BOOK and complete EACH to show the path of the ray after passing through the lens - 8.4.3
Answer
In diagram 8.4.3, draw a line representing the ray that enters the lens parallel to the principal axis, and refracts to diverge on the opposite side, indicating the correct angle and direction of the emitted ray.