Huygens Principle — MCQ Practice

According to Huygens' Principle, every point on a given wavefront acts as a source of secondary wavelets. What is the shape of these secondary wavelets?

A plane wavefront is incident on a plane reflecting surface. According to Huygens' Principle, if the angle of incidence is $30^circ$, what is the angle of reflection?

Light travels from medium 1 to medium 2. If the speed of light in medium 1 is $v_1$ and in medium 2 is $v_2$, and $v_1 > v_2$, what can be inferred about the refractive indices $n_1$ and $n_2$ and the bending of light?

Which of the following phenomena cannot be explained by Huygens' Principle?

A point source emits light in an isotropic medium. What is the shape of the wavefronts produced?

If light travels from a medium with refractive index $n_1$ to a medium with refractive index $n_2$, and the angle of incidence is $i$ and angle of refraction is $r$, which of the following relations is correctly derived from Huygens' Principle?