Refraction of Light
Physics ⇒ Light and Optics
Refraction of Light starts at 8 and continues till grade 12.
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A coin placed at the bottom of a beaker appears to be raised when water is poured into it. Explain why.
A pencil appears bent when placed in a glass of water. Explain why this happens.
Define the term 'critical angle' in the context of refraction.
Explain why a fish in water appears to be at a different position when viewed from above the water surface.
A coin placed at the bottom of a beaker appears to be raised when water is poured into it. 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. (sin 30° = 0.5)
A pencil appears bent when placed in a glass of water. Explain why this happens.
A ray of light passes from glass (n = 1.5) into air (n = 1.0) at an angle of incidence of 45°. Calculate the angle of refraction. (sin 45° = 0.707)
Which of the following has the highest refractive index? (1) Air (2) Water (3) Glass (4) Diamond
Which of the following is NOT a consequence of refraction? (1) Bending of a stick in water (2) Formation of a rainbow (3) Twinkling of stars (4) Echoes
Which of the following is the correct formula for refractive index? (1) n = sin i / sin r (2) n = sin r / sin i (3) n = i / r (4) n = r / i
Which of the following is the correct relationship for the critical angle (C) between two media? (1) sin C = n₂ / n₁ (2) sin C = n₁ / n₂ (3) sin C = 1 / n (4) sin C = n / 1
Fill in the blank: The path of a light ray passing through the normal at the boundary of two media _______ change direction.
Fill in the blank: The phenomenon of _______ is used in optical fibers for communication.
Fill in the blank: The phenomenon of mirage in deserts is due to _______ of light.
Fill in the blank: The refractive index of a medium is 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 refractive index depends on the wavelength of light used.
True or False: The refractive index of a medium is always greater than 1.
True or False: The speed of light increases when it enters a denser medium from a rarer medium.
