What is the condition for total internal reflection to occur?
a) Angle of incidence is greater than the critical angle
b) Angle of incidence is smaller than the critical angle
c) Angle of refraction is equal to 90°
d) Angle of incidence is 45°
In which of the following materials does total internal reflection occur?
a) Air
b) Water
c) Diamond
d) All of the above
Which phenomenon explains the working of optical fibers?
a) Reflection
b) Diffraction
c) Refraction
d) Total internal reflection
What is the critical angle in the context of total internal reflection?
a) The angle of refraction
b) The angle at which the refracted ray bends to 90°
c) The angle at which the incident ray is perpendicular to the surface
d) The angle of incidence at which total reflection occurs
What is the result if the angle of incidence exceeds the critical angle?
a) The light passes through the interface
b) The light is refracted at a larger angle
c) The light is totally reflected back into the first medium
d) The light is absorbed by the surface
Total internal reflection is observed when light moves from a medium of ________ refractive index to a medium of ________ refractive index.
a) Higher; lower
b) Lower; higher
c) Same; same
d) None of the above
What happens when light passes from water (higher refractive index) into air (lower refractive index)?
a) Total internal reflection occurs
b) The light is refracted at an angle less than the critical angle
c) The light is refracted at an angle greater than the critical angle
d) There is no refraction
What is the effect of increasing the angle of incidence beyond the critical angle?
a) More light is refracted
b) No light is refracted; all light is reflected
c) Some light is absorbed
d) Light continues to bend
Which optical phenomenon is responsible for the formation of rainbow-like patterns on soap bubbles?
a) Diffraction
b) Total internal reflection
c) Reflection
d) Refraction
What is the critical angle for a light ray passing from glass (refractive index = 1.5) into air (refractive index = 1)?
a) 41.8°
b) 48.6°
c) 53.1°
d) 60°
Which device uses total internal reflection to transmit signals over long distances?
a) Telescope
b) Camera
c) Optical fiber
d) Magnifying glass
What happens when the angle of incidence is less than the critical angle?
a) Total internal reflection occurs
b) The light is refracted into the second medium
c) The light is reflected back into the first medium
d) The light is absorbed by the second medium
What happens if light strikes the surface of a medium at the critical angle?
a) It passes through the interface
b) It is refracted at 90° to the normal
c) It undergoes total internal reflection
d) It is absorbed by the medium
Which of the following scenarios demonstrates total internal reflection?
a) Light passing from air to water
b) Light passing from water to air
c) Light passing from air to glass
d) Light passing from glass to air at an angle smaller than the critical angle
What is the refractive index of the second medium if total internal reflection occurs at the critical angle of 45°?
a) 1.5
b) 1.0
c) 2.0
d) 2.5
What happens when a beam of light is incident at the critical angle on the boundary between two media?
a) The light is completely refracted into the second medium
b) The light is totally reflected back into the first medium
c) The light is partially reflected and partially refracted
d) The light is absorbed
What is the relation between the refractive indices and the critical angle for total internal reflection?
a) sin(critical angle) = n2/n1
b) sin(critical angle) = n1/n2
c) tan(critical angle) = n2/n1
d) tan(critical angle) = n1/n2
At what angle does total internal reflection occur in optical fibers?
a) Only when the light is incident at the critical angle
b) When the angle of incidence is greater than the critical angle
c) When the angle of incidence is less than the critical angle
d) When light is traveling at the speed of light
Which of the following is a practical application of total internal reflection?
a) Magnifying lenses
b) Optical fibers for communication
c) Polarizing filters
d) Microscopes
In total internal reflection, the angle of incidence is always measured with respect to which line?
a) Surface of the medium
b) Normal to the surface
c) Direction of light propagation
d) Optical axis
If the refractive index of the first medium is 1.6 and that of the second medium is 1.2, what is the critical angle?
a) 47.4°
b) 53.3°
c) 36.7°
d) 39.3°
Which of the following would prevent total internal reflection from occurring?
a) Decreasing the refractive index of the first medium
b) Increasing the refractive index of the second medium
c) Reducing the angle of incidence
d) None of the above
What happens to the intensity of light as it undergoes total internal reflection in optical fibers?
a) It increases
b) It remains constant
c) It decreases
d) It fluctuates
Which of the following explains the formation of mirages?
a) Refraction
b) Diffraction
c) Total internal reflection
d) Reflection
In which situation will total internal reflection NOT occur?
a) Light traveling from water to air at a steep angle
b) Light traveling from air to water at a shallow angle
c) Light traveling from glass to air at a large angle
d) Light traveling from glass to water at a small angle
Which optical phenomenon allows optical fibers to transmit data over long distances?
a) Reflection
b) Refraction
c) Diffraction
d) Total internal reflection
