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 11
Describe what happens to the wavelength and frequency of light as it passes from air into glass.
Describe what is meant by the term 'critical angle' in the context of refraction.
Explain why a pencil appears bent when partially immersed in water.
Explain why stars appear to twinkle at night.
A light ray in air strikes a glass slab at an angle of 45°. If the refractive index of glass is 1.5, what is the angle of refraction? (Use sin-1(0.471) ≈ 28°)
A light ray passes from air into a medium and bends away from the normal. What can you conclude about the refractive index of the medium compared to air?
A ray of light passes from glass (n = 1.5) into water (n = 1.33) at an angle of incidence of 30°. Calculate the angle of refraction.
A ray of light passes from medium A (n = 1.6) to medium B (n = 1.2). If the angle of incidence is 40°, calculate the angle of refraction.
When a ray of light passes from air into water, it bends (1) towards the normal (2) away from the normal (3) does not bend (4) parallel to the normal. Choose the correct option.
Which of the following best explains why a fish in water appears closer to the surface than it actually is? (1) Reflection (2) Refraction (3) Diffraction (4) Dispersion
Which of the following has the highest refractive index? (1) Water (2) Air (3) Diamond (4) Glass
Which of the following is NOT a consequence of refraction? (1) Twinkling of stars (2) Formation of a rainbow (3) Bending of a stick in water (4) Formation of shadows
Fill in the blank: The path of a light ray passing through a rectangular glass slab emerges _______ to the incident ray, but displaced sideways.
Fill in the blank: The phenomenon of refraction is responsible for the apparent _______ of objects under water.
Fill in the blank: The ratio of the sine of the angle of incidence to the sine of the angle of refraction is called the _______ of the second medium with respect to the first.
Fill in the blank: The refractive index of a medium is defined as the ratio of the speed of light in _______ to the speed of light in the medium.
True or False: The angle of incidence is always equal to the angle of refraction.
True or False: The direction of a light ray does not change if it enters a new medium at 90° to the surface.
True or False: The refractive index of a medium depends on the wavelength of light used.
True or False: Total internal reflection can only occur when light travels from a denser to a rarer medium.
