Topic 4: Waves

Question 1

Outline what is meant by the principle of superposition of waves.

Answer 1

When two waves meet, the resultant displacement is the vector sum of their individual displacements.

Question 2

Describe the appearance of the new pattern formed when one of the slits in a double-slit diffraction are covered.

Answer 2

• Less intense as less light passing through
• Bright central maxima
• Subsidiary maxima on either side

Question 3

Explain the formation of intensity minima.

Answer 3

• the minima are formed by destructive interference
• when waves are π out of phase

Question 4

REFRACTION AND REFLECTION

Question 5

What is the phase change if first refractive index > second refractive index?

Answer 5

π

Question 6

What is the Rayleigh criterion for resolution?

Answer 6

The central maximum of one diffraction pattern lies over the first minimum of the other diffraction pattern.

Question 7

OUtline how a standing wave is formed