Please select a subject first
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Under what circumstances there won’t be any refraction of light when it enters from one medium to another?
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Why a pencil partly immersed in water appears to be bent at the water surface.
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How do twinkling stars occur? (or) what is the cause of the twinkling of stars?
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Match the following:
| Column I | Column II | ||
| 1. | r > 90 | a. | Light gazes at the surface of separation between the two modes. |
| 2. | r = 90 | b. | No refraction. |
| 3. | r < 90 | c. | Refracted ray away from the normal |
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The depth of an ocean can be determined by ______.
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Expand the abbreviation of the term SONAR.
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A homogeneous mixture of two or more substances is called ______.
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Why should gametes be produced by meiosis during sexual reproduction?
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______ break down organic matter and animal waste into ammonia.
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Name two common mosquitoes and the diseases they transmit.
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The entire light is reflected back into the denser medium is called ______.
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The outer concentric shell in optic fiber is called ______.
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A bundle of glass threads, each of which is capable of transmitting messages using light waves is called ______.
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Which of the following statements about total internal reflection is true?
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The critical angle is defined as the angle of incidence at which the total internal reflection starts to occur.
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Optical Fibres are based on the phenomenon of dispersion.
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The angle of incidence at which the angle of refraction is Q£ is called the critical angle.
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What are the conditions to achieve total internal reflection?
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What is a mirage? How does it occur?
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What is the phenomenon used in optical fiber? Explain.
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