Free problems arranged by topic
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

 Free problems: all problems
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

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# Physics problems:Optics

Part 3

Problem 21.

Light of wavelength 650 nm passes through two slits separated by 0.2 mm. The interference pattern is observed on a screen 1.5 m behind the slits. What is the distance between bright fringes of orders 1 and 3.

Solution

Problem 22.

In a double-slit experiment the wavelength of the light is 600 nm. A very thin piece of glass (index of refraction is 1.4) is placed over one of the slits. Afterward, the central point on the screen is occupied by what had been m=9 bright fringe. What is the thickness of the glass film?

Solution

Problem 23.

In a double-slit experiment the distance between two nearest bright fringes on a screen, which is 1.2 m behind the slits, is 5 mm. The wavelength of the light is 550 nm. What is the distance between the slits?

Solution

Problem 24.

A double slit illuminated with light of wavelength 650 nm forms a diffraction pattern on a screen 30 cm away. The slit separation is 3000 nm. What is the distance between bright fringes of orders 16 and 15?

Problem 25.

The bright fringes from a double-slit are 15 mm apart on a detector that is 1.2 m from the slits. If the slits are illuminated with 650 nm light, how far apart the slits are?

Solution

Problem 26.

How wide is a single slit that gives its second minimum at

Solution

Problem 27.

A single slit illuminated with a 550 nm light gives a diffraction pattern on a far screen with its fifth order minimum at  from zeroth order. At what angle does the order m=7 occur?

Problem 28.

What is the angular separation of two spectral lines of wavelengths 550 nm and 600 nm formed in order m=3 with a 529 line/mm grating?

Solution

Problem 29.

A grading with 800 lines/mm is illuminated with light of wavelength 550 nm. What is the angular separation between the two lines formed in order m=2?

Solution

Problem 30.

How long does it take for light to travel a distance of 10 m in vacuum?

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