Carefully analyses the diagram and choose the correct option :
$i$ and $ii$ are true
$i$ and $iii$ are true
$i$ and $iv$ are true
$ii$ and $ii$ are true
The rays of light first converge and then diverges.
Is Huygen's principle valid for longitudunal sound waves ?
Huygen’s principle of secondary wavelets may be used to
A plane wavefront travelling in a straight line in vacuum encounters a medium of refractive index $\mu$. At $P,$ the shape of the wavefront is :
What is the shape of the wavefront in each of the following cases:
$(a)$ Light diverging from a point source.
$(b)$ Light emerging out of a convex lens when a point source is placed at its focus.
$(c)$ The portion of the wavefront of light from a distant star intercepted by the Earth.
Newton postulated his corpuscular theory on the basis of
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