Figure, shows wave fronts in still water moving in the direction of the arrow towards the interface $PQ$ between a shallow region and a deep(denser) region. Which of the lines shown may represent one of the wave fronts in the deep region?
$I$
$II$
$III$
$IV$
A plane wave passes through a convex lens. The geometrical shape of the wavefront that emerges is
Explain the refraction of a plane wavefront with a thin convex mirror.
In the adjoining diagram, a wavefront $AB$, moving in air is incident on a plane glass surface $XY$. Its position $CD$ after refraction through a glass slab is shown also along with the normals drawn at $A$ and $D$. The refractive index of glass with respect to air ($\mu = 1$) will be equal to
When a plane wave front incident on a concave mirror as shown in figure then shape of reflected wave front
Consider a point at the focal point of a convergent lens. Another convergent lens of short focal length is placed on the other side. What is the nature of the wavefronts emerging from the final image ?