Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Ray Optics

Question:

Which of the following phenomena happens because refractive index varies with wavelength?

Options:

A lens focuses light

             

 A prism brakes sunlight into different colors

 Total internal reflection ensures that light travels down a fiber optic cable

   Light rays entering a pond change direction at the pond’s surface

Correct Answer:

 A prism brakes sunlight into different colors

Explanation:

$\text{Dispersion is due to variation of refractive index with wavelength. } \mu_v > \mu_r$