Show the path of a refracted ray formed on refraction through a spherical lens, when (i) incident ray is parallel to the principal axis of lens, (ii) incident ray passes through principal focus (or is directed towards the principal focus) of lens. Draw ray diagrams too.

Show the path of a refracted ray formed on refraction through a spheri

1.	Show the path of a refracted ray formed on refraction through a spherical lens, when (i) incident ray is parallel to the principal axis of lens, (ii) incident ray passes through principal focus (or is directed towards the principal focus) of lens. Draw ray diagrams too.
Answer» SOLUTION :(i) As SHOWN in figure, an incident ray coming parallel to the principal axis of convex lens, after refraction, passes through its principal focus `F_(2)`, on the other side of lens. In case of a concave lens, as shown in Figure, the refracted ray appears to DIVERGE from the principal focus `F_(1)` locaed on the same side of lens. (ii) For a convex lens, a light ray passing through its principal focus `F_(1)` will emerge parallel to the principal axis after refraction. In case of a concave lens, a light ray appearing to meet at principal focus `F_(2)` will emerge parallel to the principal axis after refraction.