Physics Class 10 Practical 25 Important Viva Questions with Answers (To trace the path of a ray of light through glass prism and measure the angle of deviation )

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Viva Questions and Answers

Question 1: What is a prism? 
Answer: A prism is a transparent optical element with flat, polished surfaces that refract light. Typically, it has triangular bases and rectangular sides.

Question 2: What is the angle of deviation? 
Answer: The angle of deviation is the angle between the incident ray and the emergent ray after the light passes through the prism.

Question 3: How do you trace the path of a light ray through a prism? 
Answer: Shine a light ray at an angle into one face of the prism. Mark the incident ray, the refracted ray inside the prism, and the emergent ray. Use a protractor to measure the angles of incidence, refraction, and deviation.

Question 4: Why does light bend when it enters and exits the prism? 
Answer: Light bends due to refraction, which occurs because of the change in speed as it passes from one medium (air) to another (glass) with a different refractive index.

Question 5: What is the refractive index of a material? 
Answer: The refractive index is a measure of how much the speed of light is reduced inside a material compared to its speed in a vacuum.

Question 6: How is the angle of incidence defined? 
Answer: The angle of incidence is the angle between the incident ray and the normal (perpendicular) to the surface at the point of incidence.

Question 7: How is the angle of refraction defined? 
Answer: The angle of refraction is the angle between the refracted ray and the normal to the surface at the point of refraction.

Question 8: What is Snell’s Law? 
Answer: Snell’s Law relates the angles of incidence and refraction to the refractive indices of the two media. It is given by n sin(θ1)=n 2sin(θ2), where n1 and n2 are the refractive indices of the first and second medium, and θ1 and θ2 are the angles of incidence and refraction, respectively.

Question 9: How do you calculate the angle of deviation? 
Answer: The angle of deviation δ can be calculated using the formula: δ=θ1+θ2−A where θ1 is the angle of incidence, θ2 is the angle of emergence, and A is the angle of the prism.

Question 10: What factors affect the angle of deviation? 
Answer: The angle of deviation is affected by the angle of incidence, the angle of the prism, and the refractive index of the material of the prism.

Question 11: What is the minimum angle of deviation? 
Answer: The minimum angle of deviation is the smallest angle of deviation that can be observed and occurs when the light passes symmetrically through the prism, i.e., the angle of incidence equals the angle of emergence.

Question 12: How do you identify the emergent ray? 
Answer: The emergent ray is identified as the ray that exits the prism on the side opposite to the incident ray and is bent away from the direction of the incident ray.

Question 13: What is the prism formula? 
Answer: The prism formula relates the angle of the prism (A), the angle of minimum deviation (δmin), and the refractive index (n) as follows:n=sin⁡(A+δmin2)sin⁡(A2)

Question 14: Why does the prism disperse light into different colors? 
Answer: The prism disperses light into different colors due to dispersion, which occurs because different wavelengths of light are refracted by different amounts. Shorter wavelengths (blue/violet light) are refracted more than longer wavelengths (red light).

Question 15: How does the angle of the prism affect the path of the light ray? 
Answer: A larger prism angle results in a greater deviation of the light ray. The relationship between the angle of the prism and the path of the light ray is crucial for determining the angle of deviation.

These questions cover fundamental concepts and practical aspects of the experiment to trace the path of a ray of light through a glass prism and measure the angle of deviation.