Learning Introductory Physics with Activities

The 3rd bright fringe of a double-slit interference pattern is 30.0 cm above the central bright fringe. If the angle from the horizontal (the central bright fringe) to this 3rd bright fringe is 12.0 degrees, what is the distance (in meters) between the double slits and the viewing screen?

A 500 nm laser illuminates a double-slit apparatus with a slit separation distance of 7.73 \(\mu\)m. What is the angle (in degrees) from the horizontal to the 4th bright fringe?

A 680 nm laser illuminates a double-slit apparatus with a slit separation distance of 7.83 \(\mu\)m. On the viewing screen, you measure the distance from the central bright fringe to the 2nd bright fringe to be 88.2 cm. How far away (in meters) is the viewing screen from the double slits?

A laser of unknown wavelength is used to illuminate a single slit of width 100 \(\mu\)m. A viewing screen is placed 1.50 meters away from the slit. A measurement between the central bright fringe and the 2nd dark fringe yields a result of 1.95 cm. What is the wavelength (in nm) of the laser?

Light traveling from water enters a horizontal slab of glass. The light makes an angle of 20° with respect to the horizontal surface of the glass. The indexes of refraction for water and glass are \(n_{water} = 1.33\) and \(n_{glass} = 1.52\text{.}\) Calculate the angle of refraction (in degrees).

Light traveling from air strikes a horizontal slab of unknown material. The light makes an angle of 40° with respect to the perpendicular of the horizontal surface. The angle of refraction is measured to be about 29.4°. What is the index of refraction of this unknown material?

At what minimum incidence angle (in degrees) will you get total internal reflection of light that is traveling from water into a layer of ice? Note that \(n_{water} = 1.33\text{,}\) and \(n_{ice} = 1.31\text{.}\)

Consider a thin diverging lens with a focal length of 4 cm. A 2-cm-tall object is placed 8 cm in front of the lens. Use ray tracing to answer the following items:

What is the focal length, in cm, of a magnifying glass (a thin converging lens) that produces a magnification of 3.00 when it is held 5.00 cm away from an object?