Jharkhand Polytechnic Important Questions 2nd Semester Physics

Syllabus of Chapter Light:

Properties of light Reflection, refraction, Snell’s law, physical significance of refractive index, definition of dispersion of light along with ray diagram. (Numericals on refractive index)

Marks: 06

Here are some important questions based on the topics mentioned in the syllabus:

Properties of Light:

1. Define the term "light" and explain its dual nature.
2. Describe the characteristics of electromagnetic waves to which light belongs.
3. How does the speed of light change when it enters a different medium? Explain using the concept of wavelength and frequency.
4. Explain the phenomenon of polarization of light. Provide examples of where polarized light is encountered.
5. What is the relation between the wavelength, frequency, and speed of light? Express this relation mathematically.

Reflection:

6. Define the term "reflection" of light. Explain the laws of reflection using ray diagrams.

7. A ray of light strikes a mirror at an angle of 30 degrees. Determine the angle of reflection.

8. How is the image formed in a plane mirror? Is the image real or virtual? Explain.

Refraction and Snell's Law:

9. Define the term "refraction" of light. Explain Snell's Law and provide its mathematical expression.

10. A light ray passes from air into water. If the angle of incidence is 45 degrees and the refractive index of water is 1.33, calculate the angle of refraction.

Refractive Index and Dispersion:

11. Define the refractive index of a medium. Explain how it is related to the speed of light in that medium.

12. What is dispersion of light? How does the refractive index vary with the color of light in a prism?

13. A glass prism is used to disperse white light. Explain the formation of a spectrum of colors using ray diagrams.

Numericals on Refractive Index:

14. Calculate the speed of light in a medium with a refractive index of 1.5, given the speed of light in vacuum as \(3.00 \times 10^8\) m/s.

15. If a light ray travels from air (refractive index = 1.00) to a diamond (refractive index = 2.42) with an angle of incidence of 60 degrees, calculate the angle of refraction using Snell's Law.

These questions cover a range of topics from your syllabus on light, including its properties, reflection, refraction, Snell's Law, refractive index, and dispersion. They should help you in preparing for your exams or assessments.