Study the diagram of a periscope below in which light rays A and B strike mirrors 1 and 2 respectively - English General - NSC Technical Sciences - Question 6 - 2024 - Paper 1
Question 6
Study the diagram of a periscope below in which light rays A and B strike mirrors 1 and 2 respectively. Use the information given in the diagram to answer the questi... show full transcript
Worked Solution & Example Answer:Study the diagram of a periscope below in which light rays A and B strike mirrors 1 and 2 respectively - English General - NSC Technical Sciences - Question 6 - 2024 - Paper 1
Step 1
What types of mirrors are used in the diagram? Explain.
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Answer
The mirrors used in the diagram are plane mirrors. These mirrors reflect light in a way that the incident ray and the reflected ray lie in the same plane, satisfying the law of reflection.
Step 2
The angle of incidence at which ray A strikes mirror 1 is 1°.
6.2.1 Describe the term angle of incidence.
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The angle of incidence is defined as the angle formed between the incident ray and the normal line at the point where the ray strikes the surface of the mirror.
Step 3
6.2.2 How will the magnitude of the angle at which ray A is reflected compare to angle 1°? Write down EQUAL TO, SMALLER THAN OR GREATER THAN.
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The angle at which ray A is reflected is EQUAL TO the angle of incidence, which is 1°.
Step 4
6.3.1 Write down the NAMES OF TWO physical phenomena that take place at point A as white light strikes the water droplet.
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The two physical phenomena are Refraction and Dispersion.
Step 5
6.3.2 Explain why white light splits into its component colours as it passes the air-water interface.
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White light splits into its component colours because different wavelengths of light are refracted by different amounts when they pass from air into the water droplet, causing the light to spread out into a spectrum.
Step 6
6.4.1 Define the term critical angle.
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The critical angle is the angle of incidence beyond which light cannot pass through the boundary between two media and is instead reflected back into the medium.
Step 7
6.4.2 Write down the NAME of the phenomenon described by the underlined words.
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Total Internal Reflection.
Step 8
6.4.3 Give one practical application of the phenomenon taking place from section BC to DE.
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One practical application is the use of optical fibers in telecommunications, where light signals are transmitted through glass or plastic fibers using the principle of total internal reflection.
