Quiz for Interference

Q1: Interference in light waves occurs due to:

A. Superposition of waves B. Reflection of waves C. Refraction of waves D. Polarization

Q2: In Young’s double slit experiment, bright fringes are formed due to:

A. Destructive interference B. Constructive interference C. Total internal reflection D. Polarization

Q3: In Young’s experiment, the fringe width depends on:

A. Wavelength of light B. Distance between slits C. Distance between slits and screen D. All of these

Q4: Fringe width in YDSE is given by:

A. β = λD/d B. β = d/λD C. β = λ/dD D. β = Dλd

Q5: In interference, dark fringes are due to:

A. Constructive interference B. Destructive interference C. Diffraction D. Reflection

Q6: Condition for constructive interference is:

A. Path difference = nλ B. Path difference = (2n+1)λ/2 C. Path difference = λ/4 D. No phase difference

Q7: Path difference for destructive interference is:

A. nλ B. (2n+1)λ/2 C. 2nλ D. 3nλ/2

Q8: In YDSE, the central fringe is always:

A. Dark B. Colored C. Bright D. Unstable

Q9: Fringes are equally spaced when:

A. Slits are unequal B. Screen is curved C. Monochromatic light is used D. White light is used

Q10: If slit separation is doubled, fringe width becomes:

A. Half B. Double C. Four times D. Same

Q11: The ratio of intensities of two interfering waves is 4:1. The ratio of maximum to minimum intensity is:

A. 9:1 B. 4:1 C. 5:3 D. 3:5

Q12: To observe sustained interference, two sources must be:

A. Coherent B. Same amplitude C. Opposite phase D. Different wavelength

Q13: If the light used in YDSE is replaced by white light, then:

A. Fringes disappear B. Colored fringes are observed C. Only red fringes appear D. Only blue fringes appear

Q14: Fringe visibility depends on:

A. Intensity ratio of sources B. Screen size C. Slit thickness D. Wavelength

Q15: In YDSE, path difference is zero at:

A. First bright fringe B. First dark fringe C. Central maximum D. Second dark fringe

Q16: In YDSE, if wavelength increases, fringe width:

A. Increases B. Decreases C. Remains constant D. Becomes zero

Q17: Which experiment confirms the wave nature of light?

A. Photoelectric effect B. Compton scattering C. Young’s double slit D. Thomson’s experiment

Q18: What is the effect of increasing screen distance D in YDSE?

A. Fringe width increases B. Fringe width decreases C. No change D. Fringes vanish

Q19: Incoherent sources do not produce interference because:

A. Their amplitude is zero B. They are out of phase C. Their phase difference keeps changing D. They have high frequency

Q20: If wavelength of light is doubled, the number of fringes:

A. Becomes half B. Doubles C. Remains same D. Becomes zero