Total internal reflection occurs when light travels:

From a denser to a rarer medium

From a rarer to a denser medium

Through a transparent medium only

The condition for total internal reflection is that the angle of incidence must be:

Greater than the critical angle

The critical angle is defined as the angle of incidence at which the refracted ray:

Travels along the boundary between the two media

Which of the following is an application of total internal reflection?

Optical fibers in communication

Refraction through a convex lens

Image formation in a plane mirror

Scattering of light in the atmosphere

What happens to light when the angle of incidence is less than the critical angle?

It undergoes partial reflection and refraction

If the refractive index of medium 1 is 1.5 and medium 2 is 1.0, the phenomenon of total internal reflection will occur if the light:

Travels from medium 1 to medium 2 at an incidence angle greater than the critical angle

Travels from medium 2 to medium 1

Travels from medium 1 to medium 2 at an incidence angle less than the critical angle

Travels through both media at any angle

The wavelength of an EM wave in a medium compared to its wavelength in vacuum is:

Depends on the permeability only

What does Snell's Law describe?

The bending of light as it passes from one medium to another

The reflection of light at a surface

The scattering of light in a medium

The absorption of light in a medium

What does the refractive index (n) of a medium measure?

Light's speed reduction in the medium

Light's absorption in the medium

Light's frequency change in the medium

Light's temperature change in the medium

What does the first law of reflection state?

Angle of incidence equals angle of reflection

Reflected ray bends toward the normal

Incident ray is perpendicular to the surface

Angle of incidence equals angle of refraction

What is the paraxial approximation? Assumes __________________.

small-angle light rays near the optical axis

all rays travel parallel to the axis

A loop of wire is moved through a uniform magnetic field. To increase the magnitude of the induced current, which actions is most effective?

Increasing the speed of the loop's motion.

Decreasing the speed of the loop's motion.

Orienting the loop parallel to the magnetic field.

A magnetic field is changing at a constant rate near a conductive loop. What factor directly determines the direction of the induced current in the loop?

The orientation of the loop relative to the field change.

The magnitude of the magnetic field.

The rate of change of the magnetic field.

The resistivity of the wire composing the loop.

A solenoid is used to induce an EMF in a nearby coil. If the rate of change of current in the solenoid is increased, while keeping the geometry constant, what is the effect on the induced EMF in the coil?

The induced EMF increases proportionally.

The induced EMF remains unchanged.

The induced EMF increases with the square of the rate.

A changing magnetic field induces an emf, which in turn generates a current. The rate at which the field changes plays a critical role in determining the strength of the induced current. What effect does a faster change in the magnetic field have?

Induced current remains constant

Induced current reverses direction

An electromagnetic wave travels through a medium where the permittivity is increased. What direct effect does this change have on the wave's speed, assuming permeability remains constant?

It changes in a non-linear way.

Different materials have different optical properties that influence how light propagates. Air and glass have different refractive indices and electromagnetic properties. Why does light travel faster in air than in glass?

stronger interaction with atoms

greater electromagnetic resistance

The critical angle is the minimum angle at which total internal reflection can take place. If the angle of incidence is too small, the light will refract instead of reflecting. How must the angle of incidence compare to the critical angle for total internal reflection to occur?

greater than the critical angle

smaller than the critical angle

Snell's Law states that the angle of refraction depends on the refractive index of a medium. Since different colors of light have different refractive indices, they bend at different angles. How does this variation cause dispersion?

light scatters in all directions

light reflects inside the prism

Dispersion is responsible for the formation of a spectrum of colors when light passes through a prism. How does Snell's Law help in understanding the separation of colors in a spectrum?

It shows that light bends at different angles

It shows that light travels faster in a prism

It shows that light travels slower in a prism

It shows that light bends at the same angle

Dispersion occurs when:

Different wavelengths of light refract by different amounts

Light waves merge into a single wavelength

Light undergoes total internal reflection

Light is completely absorbed by a medium

The refractive index (n) of a medium depends on:

The speed of sound in the medium

Q4 REVIEWER GENPHYSICS 2 Quiz

63 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is induced emf?

The voltage generated by a stationary magnetic field

The voltage generated by a changing magnetic field

The voltage generated by a constant electric field

The voltage generated by a moving electric field

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

According to Faraday's Law, the magnitude of the induced emf depends on:

The mass of the conductor

The rate of change of magnetic flux

The color of the conductor

The temperature of the magnet

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following increases the magnitude of the induced current?

Increasing the resistance of the circuit

Decreasing the number of turns in the coil

Increasing the strength of the magnetic field

Keeping the magnetic flux constant

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The direction of the induced current is determined by:

Faraday's Law only

Ohm's Law

Lenz's Law

Newton's Third Law

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which action would not increase the induced emf in a coil?

Moving the magnet faster

Increasing the number of turns in the coil

Using a weaker magnetic field

Rotating the coil more quickly

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the magnetic flux through a loop is constant, the induced emf is:

Maximum

Zero

Increasing

Negative

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which law quantitatively describes the induced emf in a coil due to a change in magnetic flux?

Ohm's Law

Faraday's Law

Coulomb's Law

Ampere's Law

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Q4 REVIEWER GENPHYSICS 2

What is induced emf?

According to Faraday's Law, the magnitude of the induced emf depends on:

Which of the following increases the magnitude of the induced current?

The direction of the induced current is determined by:

Which action would not increase the induced emf in a coil?

If the magnetic flux through a loop is constant, the induced emf is:

Which law quantitatively describes the induced emf in a coil due to a change in magnetic flux?

What is the term for the total magnetic field lines passing through a given area?

Faraday's Law states that the induced EMF is proportional to which rate?

Total internal reflection occurs when light travels:

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