Critical Angle, Total Internal Reflection & Optical Phenomen

Infrared light travels in optical fibers at high speed due to

• refraction

• dispersion

• total internal reflection

• refraction and dispersion

Which of the phenomena below is NOT involved in the formation of rainbows?

• Reflection

• Refraction

• Diffraction

• Dispersion

Which of the following is/are the condition(s) for total internal reflection to take place?

• I only

• II only

• I and II only

• II and III only

Which of the following phenomena causes the formation of the rainbow?

• I and II only

• I and III only

• II and III only

• I,II and III

Light travels through a glass block as shown below.

Which angle is the critical angle for light in the glass?

• A

• B

• C

• D

Three rays of light are incident on the boundary between a glass block and air. The angles of incidence are different.What is the possible critical angle for light in the glass?

• 15^o

• 30^o

• 45^o

• 60^o

Calculate the critical angle for Zircon which has a refractive index of n= 2.

• 30^o

• 45^o

• 60^o

• 90^o

Light traveling in glass is incident on a glass-air boundary. The angle of incidence of the light is greater than the critical angle. Which arrow shows the direction of the light after it is incident on the boundary?

• A

• B

• C

• D

Which of the following statements is correct?

• Total internal reflection only occurs when light travels from air to glass

• The larger the refractive index of glass, the larger is the critical angle

• When total internal reflection occurs, the angle of incidence is equal to the angle of reflection

• When total internal reflection occurs, the angle of incidence is less than the critical angle.

The figure below is an optical phenomenon caused by the refraction of light. What is this effect called?

• Dispersion

• Mirage

• Rainbow

• Diffraction