Total Internal Reflection and Critical Angle Classwork

The ray that has the largest critical angle when moving from water to air is the ...... ray

• violet

• blue

• yellow

• green

If n_benzene > n_water > n_glass then the ratio of the critical angle between the glass and the benzene to the critical angle between the water and the benzene is . . .

• less than one

• greater than one

• equal to one

• can't be determined

In the opposite figure, if the refractive index of the prism material is 1.5. The value of angle θ is approximately ................

• 10°

• 15°

• 50°

• 80°

A triangular prism is placed inside a glass container containing water, as shown in the figure. If the light ray is totally reflected at point (X) and exits normally from face (BC), Which of the following cases is correct? (Knowing that n_water = 4/3, and n_glass = 3/2)

• sin(φ₂) > 8/9

• sin(φ₂) = 9/8

• sin(φ₂) = 8/9

• sin(φ₂) < 8/9

The corresponding figure shows an optical fiber, the critical angle of its material is 51.4°. The angle of incidence of the light ray from the air is...

• 48.1°

• 54.4°

• 51.4°

• 35.6°

The figure shows an image of a palm tree on the surface of the Earth. In order to see the image inverted, the order of the wavelength of light in the three layers of air is .....

• λ₁ < λ₂ < λ₃

• λ₂ < (λ₁ = λ₃)

• λ₁ = λ₂ = λ₃

• λ₁ > λ₂ > λ₃

If you know that n_glass = 1.5 , which of the following figures represents the incident ray suffers a total internal reflection?

• B, C.

• D, C.

• A, C.

• B, A.

A ray of light travels from X to Y along an optical fiber. The angle of incidence at Y is greater than the critical angle. In which direction does the ray of light travel after reaching point Y?

• A

• B

• C

• D

If the speed of light in the two media X, Y respectively are 2.4 × 10⁸ m/s and 1.8 × 10⁸ m/s, the critical angle between the two media will be .......

• 48.59° and located in the medium X

• 48.50° and located in the medium Y

• 53.13° and located in the medium X

• 53.13° and located in the medium Y

In fiber optical cables, why can light retain its intensity?

• Because the angle of exit is too small for the materials used.

• Because the critical angle with air is not equal on either side.

• Because the optical fiber has a total internal reflection.

• Because the cable materials do not contact with air.