Define refraction.
What is the name given to the angle of incidence (Θ) if light ray PQ follows the path of QS in diagram A?
What is the magnitude (in degrees) of ... show full transcript
Worked Solution & Example Answer:Define refraction - NSC Technical Sciences - Question 6 - 2021 - Paper 1
Step 1
Define refraction.
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Answer
Refraction is the bending of light when it passes from one medium to another of different optical densities.
Step 2
What is the name given to the angle of incidence (Θ) if light ray PQ follows the path of QS in diagram A?
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Answer
The angle of incidence corresponding to light ray QS is known as the critical angle.
Step 3
What is the magnitude (in degrees) of the angle of refraction for the angle of incidence in QUESTION 6.2?
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Answer
The magnitude of the angle of refraction is 90 degrees when the angle of incidence equals the critical angle.
Step 4
Which ONE of the two media is optically denser in diagram A? Write only MEDIUM 1 or MEDIUM 2. Give a reason for your answer.
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Answer
MEDIUM 1. Light ray QS bends away from the normal, indicating that medium 1 is optically denser than medium 2.
Step 5
Identify the light ray that undergoes total internal reflection in diagram B.
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Answer
The light ray that undergoes total internal reflection is QR.
Step 6
State TWO conditions for total internal reflection to occur.
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The light must travel from a more optically dense to a less optically dense medium.
The incident angle must be greater than the critical angle.
