Question

The wave theory of light, in its original form, was first postulated by:
$\left( A \right)$ Isaac Newton
$\left( B \right)$ Christian Huygens
$\left( C \right)$ Thomas Young
$\left( D \right)$ Augustin Jean Fresnel

Answer 1

Hint: In this problem the wave theory of light was first proposed by the physicist Christian Huygens, so using this definition in its original form to get the solution to this problem.

Complete step by step answer:
 The wave theory of light was the first way we understood light. The theory was spread most notably in the 17th century (1678) by Robert Hooke and Christian Huygens.
They believed that we would see such things if Light were a wave. We’d see light reflecting bright surfaces, refracting (or bending) when passing from one layer to another, and diffracting (or spreading) across objects or going through slits. Interference can also be noticeable, where peaks or troughs of waves add up to produce brighter light, and peaks and troughs cancel out creating darker regions.
This explanation explains why light spreads out through a pinhole or slit wall, instead of going straight. So this is the required answer.
Hence option (B) is the required answer.

Note: Isaac Newton – discovered gravity law.
Thomas Young – discovered the concept of light interference.
Augustin Jean Fresnel — He may be best known for inventing the Fresnel catadioptric (reflective / refractive) lens and pioneering the use of "stepped" lenses to improve the visibility of lighthouses.