Refraction of Light
Physics ⇒ Light and Optics
Refraction of Light starts at 8 and continues till grade 12.
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Describe the change in speed, wavelength, and frequency of light as it passes from air into water.
Describe what is meant by the term 'critical angle' in the context of refraction.
Explain why a swimming pool appears shallower than its actual depth when viewed from above.
Explain why stars appear to twinkle when observed from Earth.
A light ray passes from glass (n = 1.5) into air (n = 1.0) at an angle of incidence of 45°. Calculate the angle of refraction.
A light ray passes from water (n = 1.33) to glass (n = 1.5) with an angle of incidence of 30°. Calculate the angle of refraction.
A ray of light in air strikes a glass slab at an angle of 60°. If the refractive index of glass is 1.5, what is the angle of refraction? (Give your answer to two decimal places.)
A ray of light passes from air into a medium with a refractive index of 2.0. If the angle of incidence is 45°, what is the angle of refraction? (Give your answer to two decimal places.)
Which of the following best describes the cause of refraction?
(1) Change in the frequency of light
(2) Change in the speed of light in different media
(3) Change in the color of light
(4) Change in the direction of the source
Which of the following is NOT a consequence of refraction?
(1) Twinkling of stars
(2) Formation of a rainbow
(3) Bending of a pencil in water
(4) Formation of shadows
Which of the following is NOT an application of refraction?
(1) Lenses in spectacles
(2) Optical fibers
(3) Plane mirrors
(4) Cameras
Which of the following is the correct definition of refractive index?
(1) The ratio of the speed of light in a medium to that in vacuum
(2) The ratio of the speed of light in vacuum to that in a medium
(3) The ratio of the frequency of light in vacuum to that in a medium
(4) The ratio of the wavelength of light in a medium to that in vacuum
Fill in the blank: The bending of light as it passes through a prism is due to __________.
Fill in the blank: The phenomenon of __________ is responsible for the formation of mirages in deserts.
Fill in the blank: The phenomenon of __________ is used in the working of optical fibers.
Fill in the blank: The phenomenon where a ray of light bends as it passes from one transparent medium to another is called __________.
True or False: The frequency of light remains unchanged when it passes from one medium to another.
True or False: The refractive index of a medium 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 wavelength of light increases as it enters a denser medium.
