Question

The ray which passes through............undeviating??​

Answer 1

we can say that this light ray is incident normally on the lens. Now, we know that any normal incidence goes undeviated through the medium. Hence, a light ray incident on optical centre passes undeviated through it after refraction.

Answer 2

Explanation:

Hence, we can say that this light ray is incident normally on the lens. Now, we know that any normal incidence goes undeviated through the medium. Hence, a light ray incident on optical centre passes undeviated through it after refraction.