In a two-point source interference experiment, what determines the fringe spacing on the screen?

A. The amplitude of the waves

B. The frequency of the waves

C. The distance between the two sources

D. The speed of the waves

In Young's double-slit experiment, if the distance between the slits is decreased, the fringe spacing on the screen will:

A. Increase

B. Decrease

C. Remain the same

D. Become zero

Which type of interference results in a bright fringe in a double-slit experiment?

A. Constructive interference

B. Destructive interference

C. Partial interference

D. No interference

In thin film interference, what causes certain colours to be seen when white light is incident on the film?

A. Reflection of light

B. Refraction of light

C. Constructive and destructive interference of different wavelengths

D. Polarisation of light

Which factor does NOT affect the interference pattern observed in a double-slit experiment?

A. Wavelength of light

B. Distance between the slits

C. Distance between the screen and the slits

D. Amplitude of the waves

a) Explain the concept of path difference in the context of two-point source interference and how it relates to constructive and destructive interference. [3]

b) Two coherent sources placed 0.5 cm apart produce interference fringes on a screen 2 m away. If the wavelength of the light used is 600 nm, calculate the fringe spacing on the screen. [3]

a) Describe the phenomenon of thin film interference and how it results in the appearance of colours on a thin film. [3]

b) A thin film of oil (refractive index = 1.4) on water appears dark when viewed in white light of wavelength 500 nm. Calculate the minimum thickness of the oil film. [3]

a) Briefly explain Young's double-slit experiment and its significance in understanding wave interference. [3]

b) In Young's experiment, the slit separation is 0.2 mm and the distance between the slits and the screen is 1 m. If the light used has a wavelength of 650 nm, determine the spacing between the interference fringes on the screen. [3]

a) Describe the principle of superposition as it relates to wave interference. [2]

b) Two coherent sources produce an interference pattern on a screen. If the fifth bright fringe is 4 cm from the central maximum, calculate the distance to the tenth bright fringe. [3]

c) How would the interference pattern change if the wavelength of the light used was increased? [2]

a) What is the path difference between two waves that interfere constructively? [2]

b) In a double-slit experiment, the slit separation is 0.1 mm. If the first order maximum is observed at an angle of 0.05 radians, calculate the wavelength of the light used. [4]

c) How would the pattern differ if the slit separation was decreased? [2]