Total Internal Reflection
Physics ⇒ Light and Optics
Total Internal Reflection starts at 10 and continues till grade 12.
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Define the term 'critical angle' in the context of total internal reflection.
Describe how total internal reflection is used in endoscopes for medical examination.
Describe the path of a light ray inside an optical fiber and explain the role of total internal reflection.
Explain why a fish in water cannot see objects above the water surface beyond a certain angle.
A light ray in a fiber optic cable makes an angle of 60° with the normal at the core-cladding interface. If the critical angle is 45°, will the ray undergo total internal reflection?
A light ray in water (n = 1.33) strikes the water-air interface at 48°. Will it undergo total internal reflection? (Critical angle for water-air is about 48.8°)
A light ray is incident from water (n = 1.33) to air (n = 1.0) at 60°. Will total internal reflection occur? (Critical angle ≈ 48.8°)
A ray of light is incident at 50° from glass (n = 1.5) to air (n = 1.0). Will total internal reflection occur?
Which of the following best explains why diamonds sparkle?
(1) High refractive index causing total internal reflection
(2) Low refractive index causing more refraction
(3) Absorption of light
(4) Dispersion only
Which of the following devices uses total internal reflection as its working principle?
(1) Magnifying glass
(2) Optical fiber
(3) Microscope
(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) The angle of incidence must be less than the critical angle
Fill in the blank: The mathematical expression for the critical angle c is sin c = _______.
Fill in the blank: The phenomenon of a mirage in deserts is due to _______.
Fill in the blank: Total internal reflection occurs only when the angle of incidence is _______ the critical angle.
Total internal reflection can only occur when light travels from a _______ medium to a _______ medium.
A light ray in a fiber optic cable makes an angle of 60° with the normal at the core-cladding interface. If the critical angle is 45°, will the ray undergo total internal reflection?
A light ray in water (n = 1.33) strikes the water-air interface at 48°. Will it undergo total internal reflection? (Critical angle for water-air is about 48.8°)
A light ray is incident from water (n = 1.33) to air (n = 1.0) at 60°. Will total internal reflection occur? (Critical angle ≈ 48.8°)
A ray of light is incident at 50° from glass (n = 1.5) to air (n = 1.0). Will total internal reflection occur?
