Home › CBSE Class 12 (Science) › Physics › Wave Optics › Why do two separate sodium lamps give no steady …
Why do two separate sodium lamps give no steady fringes?
ATheir light has no fixed phase link
BBoth emit the same wavelength
CSodium light is not a wave at all
DTheir light is fully polarised
Answer & Solution
Correct answer: A. Their light has no fixed phase link
Atoms in separate lamps emit with abrupt random phase changes, so the lamps are incoherent.
Related questions
Which statement about electromagnetic waves such as light is correct?What is light called when its electric field is restricted to a single fixed direction?What did Michelson and Morley find in their search for ether?Light of 600 nm falls on a 0.2 mm slit with a screen 1 m away. What is the width of the ceDiffraction is noticeable when the slit size, versus wavelength, is?Two coherent waves each of intensity I0 superpose in phase at a point. What is the resultaPath difference is a half-integral multiple of wavelength. What is seen?In Young's experiment, slits 0.5 mm apart and a screen 1 m away are lit by 500 nm light. W