Optics 1 Question

The measure of an angle subtending a 1 cm arc, inscribed in a circle with 1 m radius, is …

0.1°

1 rad

0.01 rad

0.1 rad

0.01°

1°

0.01 rad

An arc of one-quarter of a circle subtends an angle measuring _____ radians or ____°.

π/2 radians or 90°

2π radians or 360°

π/4 radians or 45°

π radians or 180°

π/2 radians or 90°

Assume that you just calculated an angle in radians and need to quickly convert to degrees but have no access to a calculator.  Your best chance to get the measure of the angle in degrees ϑ [°] is to ...

multiply ϑ [rad] by 10

multiply ϑ [rad] by 60

divide ϑ [rad] by 60

divide ϑ [rad] by 10

multiply ϑ [rad] by 60

Light traveling from air (n_air = 1.0) enters glass (n_glass = 1.5).  If the wavelength in air is λ_air = 0.630 μm (micrometers), the wavelength λ_glass in glass is ... 

λ_glass = 0.630 μm

λ_glass = 0.945 μm

λ_glass = 0.420 μm

λ_glass = 0.360 μm

λ_glass = 0.420 μm

What is the speed of light in water (n_water = 1.33)?

2.25 ×10⁸ m/s

2.50 ×10⁸ m/s

3.00 ×10⁸ m/s

6.00 ×10⁸ m/s

2.25 ×10⁸ m/s

Light travels in a transparent uniform medium at a speed of 2.0×10⁸ m/s. What is the refractive index n of that medium?

0.666

1.5

2.0

3.0

6.0

1.5

Rays, upon leaving a lens, have vergence +2.00 D. These rays correspond to …

a focus point formed +0.50 m before the lens

a source +0.50 m before the lens

a focus point formed +0.50 m after the lens

a focus point formed +2 m after the lens

a focus point formed +0.50 m after the lens

Given that a beam of light has a +4.00 D vergence in air (n = 1.0), where is its point source of origin / point of convergence of this light?

−40 cm

−25 cm

−20 cm

+20 cm

+25 cm

+40 cm

+50 cm

+25 cm

Which of the following distinguishes UV, visible, and infrared light? (select two)

A. Wavelength

B. Phase

C. Frequency

D. Intensity

E. Duration of exposure

A. Wavelength

C. Frequency

In relation to the visible, the ultraviolet (UV) wavelength is:

A. Lesser

B. Greater

C. Same

D. We don’t know

A. Lesser

In relation to the visible, the ultraviolet (UV) frequency is:

A. Lesser

B. Greater

C. Same

D. We don’t know

B. Greater

What is the speed of light in a medium with a refractive index n = 2.0?

A. 0.75×108 m/s

B. 1.5×108 m/s

C. 3.0×108 m/s

D. 6.0×108 m/s

B. 1.5×108 m/s

Which of the following Is NOT a factor to a solar eclipse

A. Sun, Moon, and Earth line up

B. Solar disk AND lunar disk have similar size (30 arcmin)

C. Sun is brighter than the Moon

D. A new Moon

C. Sun is brighter than the Moon

Positive vergence means that the beam …

A. is converging

B. is diverging

C. is collimated

D. turns to the right

E. turns to the left

A. is converging

The units of vergence are…

A. Length

B. Inverse length (diopters)

C. Angle

D. Surface area

E. Donuts

B. Inverse length (diopters)

You’re sitting 2 m AWAY from the source. What is the value of vergence?

A. Positive 2.0 D

B. Negative 2.0 D

C. Positive 0.5 D

D. Negative 0.5 D

D. Negative 0.5 D

The wave is focusing 5 m to the right. What is the value of vergence?

A. Positive 5.0 D

B. Negative 5.0 D

C. Positive 0.2 D

D. Negative 0.2 D

C. Positive 0.2 D