This question already has an answer here:

I link 3 figures below .

enter image description here enter image description here

The white bulbs were on my backside on the ceiling as is visible in their reflection in the television. I was sitting almost between (length wise) the bulbs and the television. I took the photographs of their reflection in the LCD.

What are these crosses of rainbow coloured fringes?

Is it interference or diffraction?

And whatever of the 2 it is, how is it happening?

Why only 2 crosses of coloured fringes in the reflection of every bulb , when the angle of each bulb is different?

The bulbs were on my backside so Lloyd's mirror like explanation isn't possible.

Why only 2 crosses of coloured fringes are appearing in the reflection of all the bulbs when they are at different angles?

How is this being caused?

I don't know whether stack exchange is the right place to ask this question by uploading the pictures related to the question , but I couldn't find anyone who could give a reasoning and so I posted it here.

Ever more interesting is that the reflection of the CFL visible in 1st and 2nd pictures is not showing any such pattern.


marked as duplicate by Qmechanic Aug 29 '16 at 14:31

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • 1
    $\begingroup$ Duplicate? although the pictures are much better here. physics.stackexchange.com/q/160319 $\endgroup$ – Farcher Jul 31 '16 at 18:40
  • $\begingroup$ @Farcher But why are only 2 crosses forming in the reflection of every bulb and what is causing them ? How is interference happening here ? $\endgroup$ – Shashaank Jul 31 '16 at 18:43
  • 3
    $\begingroup$ Here is another post. physics.stackexchange.com/q/167892 $\endgroup$ – Farcher Jul 31 '16 at 18:56