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Anton [14]
3 years ago
12

Suppose a ray of light traveling in a material with an index of refraction n a reaches an interface with a material having an in

dex of refraction n b . Which of the following statements must be true for total internal reflection to occur?
Check all that apply.A. The angle of incidence must be less than the critical angle.B. na = nbC. na > nbD. The angle of incidence must be greater than the critical angle.E. The angle of incidence must be equal to the critical angle.
Physics
1 answer:
KATRIN_1 [288]3 years ago
5 0

Answer: C and D

Explanation: One of the first rule for total internal reflection to occur is that the ray must move from a dense to a less dense medium, hence refractive index of medium a must be greater than that of b.

When a ray moves from a dense to a less dense medium, the refracted ray moves away from the normal thus increasing the size of the angle of refraction (total internal refraction occurs when the angle of refraction is 90° and the angle of incidence at this point is known as the critical angle), hence the angle of incidence must be greater than the critical angle.

These points verifies option C and D

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Answer: The net force acting on the car 1,299.3 N.

Explanation:

Mass of the car = 710 kg

Initial velocity of the car of the ,u= 37 km/h= 10.27 m/s (1km\h=\frac{5}{18} m/s)

Final velocity of the car,v = 120 km/h = 33.33 m/s

time taken b y car = 12.6 sec

v-u=at

33.33m/s-10.27m/s=23.06 m/s=a(12.6 sec)

a = 1.83 m/s^2

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8 0
3 years ago
Unpolarized light of intensity I0 = 950 W/m2 is incident upon two polarizers. The first has its polarizing axis vertical, and th
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Answer:

Intensity of the light (first polarizer) (I₁) = 425 W/m²

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Explanation:

Given:

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θ = 65°

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Intensity of the light (first polarizer) (I₁) = 425 W/m²

b. Intensity of the light (second polarizer)

Intensity of the light (second polarizer) (I₂) = (I₁)cos²θ

Intensity of the light (second polarizer) (I₂) = (425)(0.1786)

Intensity of the light (second polarizer) (I₂) = 75.905 W/m²

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