A student took three concave mirrors of different focal lengths and performed the experiment to see the image formation by placing an object at different distances with these mirrors as shown in the following table.
Table:
Case No. Object-distance Focal length I 45 cm 20 cm II 30 cm 15 cm III 20 cm 30 cm
Now answer the following questions:
(a) List two properties of the image formed in Case I.
(b) In which one of the cases given in the table, the mirror will form real image of same size and why?
(c) Name the type of mirror used by dentists. Give reason why do they use such type of mirrors.
OR
(c) Look at the table and identify the situation (object distance and focal length) which resembles the situation in which concave mirrors are used as shaving mirrors? Draw a ray diagram to show the image formation in this case.
A student took three concave mirrors of different focal lengths and performed the experiment to see the image formation by placing an object at different distances with these mirrors as shown in the following table.
Table:
| Case No. | Object-distance | Focal length |
|---|---|---|
| I | 45 cm | 20 cm |
| II | 30 cm | 15 cm |
| III | 20 cm | 30 cm |
Now answer the following questions:
(a) List two properties of the image formed in Case I.
(b) In which one of the cases given in the table, the mirror will form real image of same size and why?
(c) Name the type of mirror used by dentists. Give reason why do they use such type of mirrors.
OR
(c) Look at the table and identify the situation (object distance and focal length) which resembles the situation in which concave mirrors are used as shaving mirrors? Draw a ray diagram to show the image formation in this case.
Official answer
(a) The image formed in Case I is real and inverted.
(b) In Case II, the mirror will form real image of same size.
(c) The type of mirror used by dentists is a concave mirror. They use such type of mirrors because they provide a large, clear and erect image of the teeth of patients.
Marking scheme
- 1.4 marks
Hint
Analyze the data given in the table and recall the properties of images formed by a concave mirror.
Quick oral answer
The type of mirror used by dentists is a concave mirror. They use such type of mirrors because they provide a large, clear and erect image of the teeth of patients.
Common mistakes
- 1.Incorrectly identifying the type of mirror used by dentists.
Analysis and explanation
The question requires the student to analyze the data given in the table and answer the questions based on the properties of images formed by a concave mirror.
Interesting facts
Concave mirrors are commonly used in torches, search-lights and vehicles headlights to get powerful parallel beams of light.
Question details
Q39 of 39 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2023
- Section
- Section Section E
- Marks
- 4
- Chapter
- Light — Reflection and Refraction
- Topic
- Reflection of Light
- Bloom's level
- Understanding
- Syllabus topic
- Reflection of Light
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2023?
This question carries 4 marks in the CBSE Class 10 Science 2023 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 "Reflection of Light" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2023 paper?
This question appears in Section Section E in the CBSE Class 10 Science 2023 paper.