Top 20 Viva Questions with Answers: Concave Mirror Physics Practical (Class 10/12)
Are you preparing for your Physics practical viva on the experiment "To study the nature and size of the image formed by a concave mirror on a screen using a candle and a screen"? You're in the right place!
In this post, we’ve compiled the top 20 viva questions and answers to help you understand the concept thoroughly and confidently face your examiners. Each answer includes a brief explanation to reinforce your concepts.
Top 20 Viva Questions & Answers: Concave Mirror Practical
1. Question: What type of mirror is used in this experiment?
Answer: Concave mirror
Explanation: A concave mirror reflects light inward and can form real images on a screen, which is essential for this experiment.
2. Question: What is the aim of this experiment?
Answer: To study the nature and size of the image formed by a concave mirror using a candle and a screen.
Explanation: The practical demonstrates how the position of an object affects the size and type of image produced by a concave mirror.
3. Question: What kind of image does a concave mirror form?
Answer: It forms real or virtual, inverted or erect, magnified or diminished images depending on the object's distance.
Explanation: Image characteristics depend on object placement relative to the mirror's focal point and center of curvature.
4. Question: What is the focal point of a concave mirror?
Answer: The point where parallel rays converge after reflection.
Explanation: It lies midway between the pole and center of curvature of the mirror.
5. Question: What happens when an object is placed at the center of curvature?
Answer: The image is real, inverted, and of the same size at the center of curvature.
Explanation: At this point, the mirror reflects light back to form an equally sized image at the same location.
6. Question: Where is the image formed when the object is placed beyond the center of curvature?
Answer: Between the center of curvature and the focus.
Explanation: The image is real, inverted, and smaller in size.
7. Question: What is the nature of the image formed when the object is at the focus?
Answer: No image is formed on the screen.
Explanation: Reflected rays are parallel and never meet; hence, no real image is formed on the screen.
8. Question: What kind of image is formed when the object is placed between the focus and pole?
Answer: Virtual, erect, and magnified.
Explanation: This is the only case where the concave mirror forms a virtual image, not projectable on a screen.
9. Question: How can you identify the focal length in this experiment?
Answer: By finding the point where a distant object’s rays converge.
Explanation: Place the mirror facing a distant object and move the screen to locate the sharp image, giving you the focal length.
10. Question: What is the center of curvature?
Answer: It is the center of the sphere of which the mirror is a part.
Explanation: It helps in determining mirror geometry and image formation.
11. Question: What do you observe when the object is moved closer to the mirror?
Answer: The image becomes larger and eventually virtual.
Explanation: As the object enters between the focus and pole, the mirror reflects a magnified virtual image.
12. Question: Why is a screen used in the experiment?
Answer: To observe the real image formed by the mirror.
Explanation: Real images can be projected onto a screen, unlike virtual ones.
13. Question: What kind of surface does a concave mirror have?
Answer: Reflecting surface is curved inward.
Explanation: This design allows it to converge light rays to a point.
14. Question: Can a concave mirror form a virtual image?
Answer: Yes, when the object is between the focus and the mirror.
Explanation: This is an exception case resulting in a virtual, erect, and magnified image.
15. Question: What is a real image?
Answer: An image formed by actual convergence of rays, projectable on a screen.
Explanation: It’s always inverted and can be seen on a screen.
16. Question: What is a virtual image?
Answer: An image that cannot be projected on a screen.
Explanation: It’s formed when rays appear to diverge from a point.
17. Question: What is the formula for the mirror equation?
Answer: 1/f = 1/v + 1/u
Explanation: It relates the focal length (f), image distance (v), and object distance (u).
18. Question: Which type of image is formed when the object is at infinity?
Answer: Real, inverted, and highly diminished at the focus.
Explanation: Parallel rays converge at the focal point forming a point-size image.
19. Question: Why is the candle flame used in this experiment?
Answer: It acts as a point source of light.
Explanation: The flame is bright, visible, and small enough to act like a light source for observing clear image formation.
20. Question: What precautions should be taken in this experiment?
Answer: Keep the apparatus stable, align the mirror properly, and record observations carefully. Explanation: Any misalignment or instability can lead to wrong observations or image distortion.
Conclusion
These top 20 viva questions for concave mirror physics practical will not only help you ace your practical exam but also give you a clear understanding of image formation principles. Remember to revise the concepts and practice the experimental setup.
Got a question we didn’t cover? Drop it in the comments below! 👇
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