The image of an object formed by a mirror is real, inverted and is of magnification – 1. If the image is at a distance of 40 cm from the mirror, where is the object placed? Where would the image be if the object is moved 20 cm towards the mirror? State reason and also draw ray diagram for the new position of the object to justify your answer.
The image of an object formed by a mirror is real, inverted and is of magnification – 1. If the image is at a distance of 40 cm from the mirror, where is the object placed? Where would the image be if the object is moved 20 cm towards the mirror? State reason and also draw ray diagram for the new position of the object to justify your answer.
Official answer
The mirror is a plane mirror. The image is formed at a distance of 40 cm from the mirror. The object is placed at a distance of 40 cm from the mirror. When the object is moved 20 cm towards the mirror, the image will also move 20 cm towards the mirror. The new position of the image will be 20 cm from the mirror. The ray diagram for the new position of the object is shown below.
Marking scheme
- 1.The mirror is a plane mirror.
- 2.The image is formed at a distance of 40 cm from the mirror.
- 3.The object is placed at a distance of 40 cm from the mirror.
- 4.When the object is moved 20 cm towards the mirror, the image will also move 20 cm towards the mirror.
- 5.The new position of the image will be 20 cm from the mirror.
Hint
The mirror is a plane mirror. The image is formed at a distance of 40 cm from the mirror. The object is placed at a distance of 40 cm from the mirror. When the object is moved 20 cm towards the mirror, the image will also move 20 cm towards the mirror. The new position of the image will be 20 cm from the mirror.
Quick oral answer
The mirror is a plane mirror. The image is formed at a distance of 40 cm from the mirror. The object is placed at a distance of 40 cm from the mirror. When the object is moved 20 cm towards the mirror, the image will also move 20 cm towards the mirror. The new position of the image will be 20 cm from the mirror.
Common mistakes
- 1.The mirror is a concave mirror.
- 2.The image is formed at a distance of 20 cm from the mirror.
- 3.The object is placed at a distance of 20 cm from the mirror.
- 4.When the object is moved 20 cm towards the mirror, the image will also move 20 cm towards the mirror, but the new position of the image will be 40 cm from the mirror.
Analysis and explanation
The mirror is a plane mirror. The image is formed at a distance of 40 cm from the mirror. The object is placed at a distance of 40 cm from the mirror. When the object is moved 20 cm towards the mirror, the image will also move 20 cm towards the mirror. The new position of the image will be 20 cm from the mirror.
Interesting facts
The mirror is a plane mirror.
The image is formed at a distance of 40 cm from the mirror.
The object is placed at a distance of 40 cm from the mirror.
When the object is moved 20 cm towards the mirror, the image will also move 20 cm towards the mirror.
The new position of the image will be 20 cm from the mirror.
Question details
Q12 of 31 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2016
- Section
- Section A
- Marks
- 3
- Type
- Short Answer
- Chapter
- The Human Eye and the Colourful World
- Topic
- The Human Eye and the Colourful World
- Bloom's level
- 3
- Syllabus topic
- The Human Eye and the Colourful World
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2016?
This question carries 3 marks in the CBSE Class 10 Science 2016 examination.
Which chapter does this question come from in Science?
This question is from the chapter "The Human Eye and the Colourful World" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "The Human Eye and the Colourful World" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2016 paper?
This is a Short Answer question from Section A in the CBSE Class 10 Science 2016 paper.