Refraction of Light
Physics ⇒ Light and Optics
Refraction of Light starts at 8 and continues till grade 12.
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See sample questions for grade 9
A coin placed at the bottom of a glass of water appears to be at a shallower depth than it actually is. Explain why.
A light ray enters from air (n = 1.0) into a medium with refractive index 1.6 at an angle of incidence of 30°. Calculate the angle of refraction (to the nearest degree).
A ray of light passes from air into a transparent material and bends towards the normal. What can you say about the refractive index of the material compared to air?
A ray of light passes from glass (n = 1.5) into water (n = 1.33) at an angle of incidence of 45°. Will the ray bend towards or away from the normal?
Define the term 'refractive index'.
Describe what happens to a light ray as it passes from a denser medium to a rarer medium at an angle.
Describe what is meant by the 'normal' in refraction.
Explain why a fish in water appears to be at a different position when viewed from above the water.
Explain why a swimming pool appears less deep than it actually is.
Explain why stars appear to twinkle at night.
If the angle of incidence is 0°, what will be the angle of refraction?
If the refractive index of a medium is 2, what is the speed of light in that medium? (Speed of light in vacuum = 3.0 × 108 m/s)
If the refractive index of glass is 1.5 and that of air is 1.0, what is the speed of light in glass if the speed of light in air is 3.0 × 108 m/s?
Light travels from medium A to medium B. If the speed of light in A is greater than in B, which medium has the higher refractive index?
Light travels from water (n = 1.33) into air (n = 1.00). If the angle of incidence is 30°, calculate the angle of refraction (to the nearest degree).
State Snell's Law of refraction.
The refractive index of water is 1.33. What does this mean?
What happens to the wavelength of light as it enters a denser medium?
What is refraction of light?
What is the main reason for the bending of light at the interface of two media?
