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 (Θ) is referred to 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 angle of refraction for the critical angle is 90°.
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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MEDIUM 1. Light ray QS bends away from the normal when passing from medium 1 to medium 2, indicating that medium 1 is optically denser.
Step 5
Identify the light ray that undergoes total internal refraction in diagram B.
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Answer
The light ray that undergoes total internal refraction in diagram B is QR.
Step 6
State TWO conditions for total internal refraction to occur.
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Answer
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.
