Light Energy
ICSE · Class 8 · Physics
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See them allState the definition of refraction of light.
Answer
Refraction of light is the change in direction of the path of light when it passes from one optically transparent medium to another.
Why does light bend towards the normal when it goes from air to water or glass?
Answer
Air is optically rarer than water and glass. When light travels from a rarer medium to a denser medium, it bends towards the normal. Example: light entering water from air bends towards the normal.
Why does light bend away from the normal when it goes from glass to air?
Answer
Glass is denser than air. When light travels from a denser medium to a rarer medium, it bends away from the normal. Example: light leaving a glass block into air bends away from the normal.
A ray of light falls normally on a boundary between two media. What happens?
Answer
It passes undeviated, along the same path, because the angle of incidence is zero.
A ray of light passes from air to water. Given speeds 3 × 10^8 m/s in air and 2.25 × 10^8 m/s in water, find the refractive index of water with respect to air.
Answer
Given: speed in air = 3 × 10^8 m/s, speed in water = 2.25 × 10^8 m/s. Formula: μ = speed of light in first medium / speed of light in second medium. Calculation: μ = (3 × 10^8) / (2.25 × 10^8) = 4/3 =…
A ray of light passes from air to glass. Given speeds 3 × 10^8 m/s in air and 2 × 10^8 m/s in glass, find the refractive index of glass with respect to air.
Answer
Given: speed in air = 3 × 10^8 m/s, speed in glass = 2 × 10^8 m/s. Formula: μ = speed of light in first medium / speed of light in second medium. Calculation: μ = (3 × 10^8) / (2 × 10^8) = 1.5. Answer…
State Snell's law of refraction.
Answer
Snell's law: sin i / sin r = constant, where i is the angle of incidence and r is the angle of refraction.
A ray of light passes from one medium to another with the same refractive index. What happens to the ray?
Answer
It remains undeviated because both media have the same refractive index.
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