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Somewhere I read that two lenses are required to create a DSLR effect- Blurring the background. But today I read, the Aperture size is responsible for blurring the background,

So any lens (single camera) with a large aperture will blur the background, so No need to add another one.

In my iPhone X, there are two lenses- wide angle and telephoto lens, so does that mean wide is used for closer objects and telephoto is used for distant objects. ??

Or

Two lenses are required to create a sort of 3d effects in portrait pictures?

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On small focal lenses (and the small sensor size of the phone requires small focal lengths), there is a very wide depth of field, so you don't get any significant background blur.

The second lens has a different perspective from the main one, and software can deduce the distance of objects from their difference between the two images, from which you can synthesize a pretend focus blur.

  • Yes. You can also say that the baseline between the lenses takes over the function of a large aperture, i.e. to perceive depth. Just like with our 2 eyes we can see far more depth than with 1 tiny pupil. – Jeroen van Duyn Jul 10 at 12:02

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