Total Internal Reflection
Physics ⇒ Light and Optics
Total Internal Reflection starts at 10 and continues till grade 12.
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See sample questions for grade 12
A ray of light is incident at 60° on the surface of a glass block (n = 1.5) in air. Will total internal reflection occur?
Describe one real-life application of total internal reflection other than optical fibers.
Describe the role of total internal reflection in the working of a prism used in binoculars.
Explain why a fish in water cannot see objects above the water surface beyond a certain angle.
Explain why diamonds sparkle more than other transparent materials.
A light ray in a medium with refractive index 1.5 is incident at 45° on the interface with air (n = 1.0). Will total internal reflection occur?
A light ray in a medium with refractive index n1 strikes the boundary with a medium of refractive index n2 (n1 > n2) at the critical angle. What is the angle of refraction?
A light ray in water (n = 1.33) strikes the water-air interface at 50°. Will it undergo total internal reflection?
A ray of light is incident at 60° on the surface of a glass block (n = 1.5) in air. Will total internal reflection occur?
Which of the following best describes the critical angle?
(1) The angle of incidence at which light is refracted at 90° to the normal
(2) The angle of incidence at which light is totally reflected
(3) The angle of refraction at which light is totally reflected
(4) The angle of incidence at which light is refracted at 0° to the normal
Which of the following devices uses total internal reflection as its working principle?
(1) Microscope
(2) Periscope
(3) Optical fiber
(4) Telescope
Which of the following is a necessary condition for total internal reflection to occur?
(1) Light must travel from a rarer to a denser medium
(2) Angle of incidence must be less than the critical angle
(3) Light must travel from a denser to a rarer medium
(4) The refractive index of the second medium must be greater than the first
Which of the following is NOT a condition for total internal reflection?
(1) Light must travel from denser to rarer medium
(2) Angle of incidence must be greater than the critical angle
(3) The refractive index of the second medium must be less than the first
(4) Light must travel from rarer to denser medium
Fill in the blank: The phenomenon of _______ is used in endoscopes for medical examination.
In an optical fiber, light is transmitted by repeated _______ at the core-cladding interface.
Total internal reflection can only occur when light travels from a _______ medium to a _______ medium.
Total internal reflection is responsible for the phenomenon of a mirage. True or False?
True or False: The critical angle increases as the refractive index of the denser medium increases.
True or False: Total internal reflection can occur when light passes from air to water.
True or False: Total internal reflection can occur when light travels from water to air if the angle of incidence is greater than the critical angle.
