22. Light from two lasers is incident on an opaque barrier with a single slit of width 2.0 x 10¹ m. One laser emits light of wavelength 440 nm and the other is 660 nm. A screen to view the light intensity pattern is 2.0 m behind the barrier. What is the distance from the center of the pattern to the nearest completely dark spot (dark for both colors)? a) 0.33 cm b) 0.66 cm c) 0.99 cm d) 1.65 cm e) 1.32 cm 23. Now only the 660 nm laser is used and a 2nd slit of the same width is made in the barrier. The centers of the slits are 2.0 x 10³ m apart. Approximately how many smaller bright spots are now observable within the central bright region? a) 30 b) 20 c) 12 d) 10 e) 8 24. The 2-slit experiment from the question above is now repeated with only the 440 nm laser. Approximately how many smaller bright spots are observable within the central bright region? a) 30 b) 20 c) 12 d) 10 e) 8

22. Light from two lasers is incident on an opaque barrier with a single slit of width 2.0 x 10¹ m. One laser emits light of wavelength 440 nm and the other is 660 nm. A screen to view the light intensity pattern is 2.0 m behind the barrier. What is the distance from the center of the pattern to the nearest completely dark spot (dark for both colors)? a) 0.33 cm b) 0.66 cm c) 0.99 cm d) 1.65 cm e) 1.32 cm 23. Now only the 660 nm laser is used and a 2nd slit of the same width is made in the barrier. The centers of the slits are 2.0 x 10³ m apart. Approximately how many smaller bright spots are now observable within the central bright region? a) 30 b) 20 c) 12 d) 10 e) 8 24. The 2-slit experiment from the question above is now repeated with only the 440 nm laser. Approximately how many smaller bright spots are observable within the central bright region? a) 30 b) 20 c) 12 d) 10 e) 8

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter4: Diffraction

Section: Chapter Questions

Problem 89AP: Monochromatic light of wavelength 530 nm passes through a horizontal single slit of width 1.5 m in...

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Concept explainers

Refraction of Light

Refraction is a change in the direction of light rays when they travel from one medium to another. It is the bending of light when it goes through different media.

Angle of Refraction

Light is considered by many scientists to have dual nature, both particle nature and wave nature. First, Particle nature is one in which we consider a stream of packets of energy called photons. Second, Wave nature is considering light as electromagnetic radiation whereas part of it is perceived by humans. Visible spectrum defined by humans lies in a range of 400 to 700 nm wavelengths.

Index of Refraction of Diamond

Diamond, the world’s hardest naturally occurring material and mineral known, is a solid form of the element carbon. The atoms are arranged in a crystal structure called diamond cubic. They exist in a huge variety of colours. Also, they are one of the best conductors of heat and have a very high melting point.

Question

(numbers 22-24) These three are related - work through in order.
22. Light from two lasers is incident on an opaque barrier with a single slit of width 2.0 x 10ª m.
One laser emits light of wavelength 440 nm and the other is 660 nm. A screen to view the light
intensity pattern is 2.0 m behind the barrier. What is the distance from the center of the pattern
to the nearest completely dark spot (dark for both colors)?
a) 0.33 cm
b) 0.66 cm
c) 0.99 cm
d) 1.65 cm
e) 1.32 cm
23. Now only the 660 nm laser is used and a 2nd slit of the same width is made in the barrier.
The centers of the slits are 2.0 x 10³ m apart. Approximately how many smaller bright spots are
now observable within the central bright region?
a) 30
b) 20
c) 12
d) 10
e) 8
24. The 2-slit experiment from the question above is now repeated with only the 440 nm laser.
Approximately how many smaller bright spots are observable within the central bright region?
a) 30
b) 20
c) 12
d) 10
e) 8

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Step 3: Determine the angle for minima in the step :

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Step 4: Determine the distance from the centre in the step :

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Step 5: Determine the fringe width in the step :

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Step 6: Determine the number of fringes in the step :

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Step 7: Determine the number of fringes for the other wavelength light in the step :

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