Q: What is the critical angle for total internal reflection when light travels from water (n = 1.33) to air (n = 1.00)? Use $$\sin \theta_c = \frac{n_2$}{n_1$}.$$

$$\theta_c \approx 48.8^\circ$$

Question 1

Which phenomenon explains why a rainbow forms when sunlight passes through raindrops?

Accepted Answer

Dispersion

Question 2

According to the wave model of light, what happens to the speed of light when it enters a material with a higher index of refraction?

Accepted Answer

The speed decreases

Question 3

A light ray passes from air (n = 1.00) into water (n = 1.33) at an angle of incidence of 30°. What is the angle of refraction? Use Snell's Law: $$n_1$$ \sin \$$theta_1$$ = $$n_2$$ \sin \$$theta_2.$$

Accepted Answer

$$\$$theta_2$$ \approx 22.1^\circ$$

Question 4

Which law states that the angle of incidence equals the angle of reflection?

Accepted Answer

Law of Reflection

Question 5

What is the main difference between mechanical waves and electromagnetic waves?

Accepted Answer

Mechanical waves require a medium, electromagnetic waves do not

Question 6

A fiber optic cable works based on which principle?

Accepted Answer

Total internal reflection

Question 7

If light passes from glass (n = 1.5) into air (n = 1.00), what happens to the angle of refraction compared to the angle of incidence?

Accepted Answer

The angle of refraction is larger than the angle of incidence

Question 8

Which equation relates the speed of light in a medium to its refractive index?

Accepted Answer

$$v = \frac{c}{n}$$

Question 9

What is the critical angle for total internal reflection when light travels from water (n = 1.33) to air (n = 1.00)? Use $$\sin 	heta_c = \frac{n_2$}{n_1$}.$$

Accepted Answer

$$	heta_c \approx 48.8^\circ$$

Question 10

Which property of light is responsible for the separation of colors in a prism?

Accepted Answer

Dispersion

Question 11

According to the photon model, the energy of a photon is directly proportional to which property?

Accepted Answer

Frequency

Question 12

A polarized light passes through an analyzer at an angle $$\phi to $$the transmission axis. According to Malus's Law, what is the transmitted intensity?

Accepted Answer

$$I = I_{max} \cos^2$ \phi$$

Question 13

Which phenomenon is observed when light passes through a narrow opening and spreads out?

Accepted Answer

Diffraction

Question 14

What is the refractive index of diamond according to the provided table?

Accepted Answer

2.417

Question 15

Which law is used to determine the polarizing angle where reflected and refracted rays are perpendicular?

Accepted Answer

Brewster's Law

Question 16

If the incident angle is greater than the critical angle, what happens to the light at the interface between two media?

Accepted Answer

It is totally internally reflected

Question 17

Which color of visible light has the shortest wavelength?

Accepted Answer

Violet

Question 18

In the context of specular and diffuse reflection, which surface produces a clear image?

Accepted Answer

A smooth surface

Question 19

Which equation describes the relationship between frequency, wavelength, and speed of light in a vacuum?

Accepted Answer

$$c = \lambda f$$

Question 20

Why do no two people see the same rainbow?

Accepted Answer

Each observer sees light reflected and refracted from different water droplets

Optical Waves: Duality, Reflection, Refraction, and Dispersion

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