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An a.c. generator changes the ______energy to ______ energy.
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State two safety measures to be taken while establishing a nuclear power plant.
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What is meant by nuclear waste?
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Name the principle on the basis of which optical fibres work.
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How does a ray of light bend when it travels from rarer to denser medium
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How does a ray of light bend when it travels from denser to rarer medium.
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How does a ray of light bend when it travels from when it is normal to the interface of the two media.
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Why do diamonds sparkle?
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Can light be ‘piped’ like sound in a doctor’s stethoscope?
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Write down the relationship between the critical angle and the refractive index of the medium.
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Express the refractive index μ of a medium in terms of the angle of incidence i in air and the angle of refraction r in a denser medium.
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If a ray of light passes from medium I to medium II without any change of direction, what can be said about the refractive indices of these media (angle I is not 0)?
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How are critical angles related to the refractive index of the medium?
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State two advantages of using a right-angle prism as a reflector, rather than a plane mirror.
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Images formed by totally reflecting prisms are brighter than the image formed by ordinary reflected light, why?
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A ray of light incident at an angle of incidence ‘i’ passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges from the prism at an angle of emergence ‘e’.
How is the angle of emergence ‘e’ related to the angle of incidence ‘i’?
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A ray of light incident at an angle of incidence ‘i’ passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges from the prism at an angle of emergence ‘e’.
What can you say about the value of the angle of deviation in such a situation?
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State one factor on which a critical angle for a given pair of media depends. The critical angle for the glass-air interface is 45° for the yellow light. Will it be equal to, less than or greater than 45° for (i) red light, (ii) blue light?
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Name the factors affecting the critical angle for the pair of media.
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What is meant by the statement, ‘the critical angle for diamond is 24°’?
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