Refraction of Light — Flashcards
ICSE · Class 10 · Physics
40 flashcards for Refraction of Light (ICSE Class 10 Physics) to test yourself on key terms and facts. Sample: "State the first law of refraction."
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See them allState the first law of refraction.
Answer
The incident ray, the refracted ray and the normal at the point of incidence lie in the same plane. This means all three remain in one flat surface.
State Snell's law.
Answer
Snell's law states that the ratio of sine of angle of incidence to sine of angle of refraction for a pair of medium is constant. Formula: sin i / sin r = constant = _a n_g This constant is the refract…
What is refractive index?
Answer
Refractive index is the ratio of sine of angle of incidence of first medium to sine of angle of refraction of second medium. It is also equal to speed of light in air or vacuum divided by speed of lig…
Why does refraction occur?
Answer
Refraction is caused by change in speed of light when it passes from one medium to another. The speed depends on refractive index of the medium. At an interface, light undergoes partial reflection and…
A ray of light goes from air into glass. In which direction does it bend?
Answer
A ray of light going from a rarer medium to a denser medium bends towards the normal. Reason: speed decreases in the denser medium. Example: Light entering water from air bends towards the normal.
A ray of light goes from glass to air. In which direction does it bend?
Answer
A ray of light going from a denser medium to a rarer medium bends away from the normal. Reason: speed increases in the rarer medium.
Does light change direction at normal incidence?
Answer
No. Direction of light changes only for oblique incidence. For normal incidence, angle of incidence is 0° and angle of refraction is also 0°. Speed may change, but direction does not change.
Which quantities change and which do not change during refraction?
Answer
Changed: speed of light and direction of light for oblique incidence. Also changed: wavelength. Unchanged: frequency of light. Reason: frequency depends on the source, not on the medium.
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