Question

how do we detect the smell of an agarbatti​

Answer 1

Answer:

The smell of an agarbatti reaches our nose by diffusion. In the nose we have olfactory receptors which sense the chemicals present in its smoke and send neural signals to brain. Brain processes it based on earlier memory and perceives it as smell.

Answer 2

$\mathfrak{\huge{\green{\underline{\underline{Answer:-}}}}}$

When the smell of the incense stick reaches our nose, then the olfactory receptors present in our nose detect it send this information to the fore brain in the form of electrical signals. Fore brain interprets this information as the smell of incense stick where it is already stored.