An object is placed between infinity and the pole of a convex mirror. Draw a ray diagram and also state the position, the relative size and the nature of the image formed.
An object is placed between infinity and the pole of a convex mirror. Draw a ray diagram and also state the position, the relative size and the nature of the image formed.
Official answer
When an object is placed between infinity and the pole () of a convex mirror, the image is formed behind the mirror, between the pole () and the focus ().
Characteristics of the image:
- Position: Behind the mirror, between and .
- Relative Size: Diminished (smaller than the object).
- Nature: Virtual and erect.
Marking scheme
- 1.Correct ray diagram with arrows showing direction (1.5 marks)
- 2.Stating position (Between P and F behind mirror) (0.5 marks)
- 3.Stating relative size (Diminished) (0.5 marks)
- 4.Stating nature (Virtual and erect) (0.5 marks)
Hint
Remember that a convex mirror always produces a virtual, erect, and diminished image for any real object position.
Quick oral answer
A convex mirror always forms a virtual, erect, and diminished image when the object is placed anywhere between infinity and the pole.
Common mistakes
- 1.Drawing a concave mirror instead of a convex one.
- 2.Forgetting to put arrows on the light rays.
- 3.Placing the image in front of the mirror.
Analysis and explanation
In a convex mirror, regardless of the object's position (except at infinity), the rays of light diverge after reflection. When these divergent rays are produced backwards, they always intersect between the pole and the focus. Because the rays do not actually meet, the image is virtual. Since the intersection occurs above the principal axis, the image is erect.
Interesting facts
Convex mirrors are used as rear-view mirrors in vehicles because they give a wider field of view and always form an erect image.
Question details
Q16 of 41 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2011
- Section
- Section A
- Marks
- 3
- Type
- Short Answer
- Chapter
- Light — Reflection and Refraction
- Topic
- Image Formation by Spherical Mirrors
- Bloom's level
- Apply
- Syllabus topic
- Reflection of light by curved surfaces; Images formed by spherical mirrors
Spotted a mistake or something unclear?
Tell us and we will fix it.
Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2011?
This question carries 3 marks in the CBSE Class 10 Science 2011 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Light — Reflection and Refraction" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Image Formation by Spherical Mirrors" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2011 paper?
This is a Short Answer question from Section A in the CBSE Class 10 Science 2011 paper.