Free Printable Physical Optics

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Physical Optics

Total questions: 30

Worksheet time: 27mins

Name

Class

Date

The combination of two or more waves that result in a single wave

A. diffraction

B. resonance

C. reflection

D. interference

When a wave bends around a barrier or passes through an opening, it is called

Diffraction

Reflection

Refraction

Interference

To demonstrate the phenomenon of interference, we require two sources

Of the same frequency and having a constant phase difference

Of nearly the same frequency

Of the same frequency

Of different wavelengths

For Young's double slit experiment, the fifth dark fringe is equivalent to:

m=4 maximum

m=5 maximum

m=4 minimum

m=5 minimum

'Every points on the wave front of light are the sources of smaller waves called wavelets.' This is the statement of

Yusnizi

Planck

Huygen

Young

Which diagram best represents the shape and direction of a series of wave fronts after they have passed through a small opening in a barrier?

What type of interference is represented in this diagram?

Constructive

Destructive

What type of interference is represented in the diagram?

Constructive

Destructive

Which of the following will increase the spacing of Young's double slit fringes

A blue light is used instead of a red light

the screen is moved closer to the slits

the slits are moved closer together

Each slit is made wider

10.

Which of the following will decrease the spacing of Young's double slit fringes

decreasing the wavelength of the waves

moving the screen further away

decreasing the distance between the slits

Using narrower slits

11.

A red light has a wavelength of 650nm.
It is shone through a double slit spacing 0.2mm onto a screen 2m away.
The fringe spacing is?

6.5 x 10 ^-6 m

1.6 x 10^-3 m

6.5 x 10^-3 m

1.6 x 10^-6 m

12.

Two light sources are said to be coherent if they

are of the same frequency.

are of the same frequency, and maintain a constant phase difference.

are of the same amplitude, and maintain a constant phase difference.

are of the same frequency and amplitude.

13.

In Young's Double slit experiment, two adjacent bright fringes are 0.5 cm apart. The distance between two dark fringes ______.

is less than 0.5 cm

is greater than 0.5 cm

is exactly 0.5 cm

is dependent on which order is observed.

14.

When two waves combine to form a new wave with a larger amplitude, it is called

Diffraction

Destructive Interference

Resonance

Constructive Interference

15.

When two waves combine to form a new wave with a smaller amplitude, it is called

Refraction

Constructive Interference

Resonance

Destructive Interference

16.

What does one observe on the screen in a Young's experiment if white light illuminates the double slit instead of light of a single wavelength?

A white central fringe and no other fringes

A dark central fringe and a series of alternating white and dark fringes on each side of the center

A white central fringe and a series of colored and dark fringes on each side of the center

A continuous band of colors with no dark fringes anywhere

17.

Which one is true about destructive interference:

Produce bright fringes

Produce dark fringes

Produce a single wave of greater amplitude (add together)

Have a one full wavelength path difference

18.

which moves faster blue shift or red shift?

one shift

two shift

red shift

blue shift

19.

The top bright fringe order is?

Fourth order minimum

Third order minimum

Fourth order maximum

Third order maximum

20.

If the distance of the slit separation is doubled, the fringe width is:

halved

doubled

no change

21.

If the space between the double slit and the screen is then filled with water, what happen to the interference pattern?

fringes remain unchange

fringes disappear

fringe increases

fringes decrease

22.

Which of the following statements is untrue when applied to Young's double slit pattern

The fringes are equally spaced

A bright fringe occurs when the waves arrive in phase

The sources must be coherent

The centre fringe is the brightest

23.

To demonstrate the phenomenon of interference, we require two sources

Of the same frequency and having a constant phase difference

Of nearly the same frequency

Of the same frequency

Of different wavelengths

24.

diffraction is waves bending because of

edges of a slit or thin object

speed of wave changes

dark matter

gravity

25.

A yellow light of wavelength 500 nm is shone through a diffraction grating with 400 lines/mm. At what angle to the straight through direction is the 2nd order fringe in degrees?

There is no 2nd order

26.

A red light of wavelength 650 nm is used with a diffraction grating with 500 lines per mm. Determine the maximum diffraction maxima seen on the screen.

27.

The nature of the wavefront for a point source of light is _____

Spherical wanefront

Plane wavefront

28.

The characteristics of wave which does not change after refraction is

Wavelength

Velocity

Frequency

29.

For Young's double slit interference distance of $n^{th}$ dark fringe from the center of the screen is

$\frac{n\lambda D}{d}$

$\frac{n\lambda d}{D}$

$\left(n+\frac{1}{2}\right)\ \frac{\lambda D}{d}$

$\left(n+\frac{1}{2}\right)\ \frac{\lambda d}{D}$

30.

For diffraction at a single Slit, the angular position for n^th minimum is

$\theta=n\lambda$

$\theta=\ \frac{n\lambda}{a}$

$\theta=\ \left(n+\frac{1}{2}\right)\frac{\lambda}{a}$

$\theta=\ \frac{na}{\lambda}$

Reset

Physical Optics

Total questions: 30

Worksheet time: 27mins

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