Question

Match list A and list B accurately :
List A List B
a) spherical wave front e) linear source
b) plane wave front f) point light source
c) cylindrical wave front g) at infinite distance

• A. ( a, f ); ( b, g); ( c, e)
• B. ( a, f ); ( b, e); ( c, g)
• C. ( a, g ); ( b, f); ( c, e)
• D. ( a, e ); ( b, g); ( c, f)

Answer 1

Answer: (A)

( a, f ); ( b, g); ( c, e)

A point light source emits a spherical wave front because a point light source is not selective of any direction and emits equally in all directions. A linear source is made of many point sources. The spherical wave front coming out from these point sources interfere with each other and produce a cylindrical wave front.
when the source is at infinite distance then the wave front as a plane wave front because a plane wave front has infinite radius.