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 4

Problem 31.

How long does it take for light to travel a distance of 5 m in water (index of refraction 1.33)?

Solution

Problem 32.

The mirror shown in the figure deflects a horizontal light ray by . What is the angle  (see figure)?

Solution

Problem 33.

A laser beam leaves point A (see figure), then reflects from the mirror, and reaches point B. At which point does the beam strikes the mirror?

Problem 34.

The distance between your eyes and your toes is 170 cm. You are standing 400 cm in front of a tall mirror. What is the distance between your eyes and the image of your toes?

Solution

Problem 35.

A light ray in air is incident on a glass slab at an angle of  measured from the normal. What is the ray’s direction in the glass? The index of refraction of the glass is 1.6.

Solution

Problem 36.

Light of wavelength 650 nm is incident normally on a soap film (index of refraction = 1.33) suspended in air. What is the least thickness of the film for which the reflection from the film undergoes fully constructive interference?

Problem 37.

A slit 1 mm wide is illuminated by light of wavelength 550 nm. The diffraction pattern is observed on a screen 2 m away. What is the distance between first two diffraction minima on the same side of the central diffraction maximum?

Solution

Problem 38.

In a double slit experiment, the slit separation is 3 times the slit width. How many bright interference fringes in the central diffraction envelope?

Solution

Problem 39.

Assume that the limits of the visible spectrum are arbitrary chosen as 450 nm and 650 nm. Calculate the number of slits per millimeter of  grating that will spread the first order spectrum through the angle of

Problem 40.

In a single-slit diffraction experiment, there is a minimum of intensity for light of wavelength 600 nm and a minimum of intensity for light of wavelength 500 nm at the same angle of 1 mrad. For which minimum slit width is this possible?

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