The given figure shows image formation by a lens. Analyse the figure and answer the following questions: (a) What is the type of lens used for image formation in the given ray diagram? (b) If the real image is formed at a distance of from the lens and the size of image is twice the size of the object, then where was the object placed?
The given figure shows image formation by a lens. Analyse the figure and answer the following questions: (a) What is the type of lens used for image formation in the given ray diagram? (b) If the real image is formed at a distance of from the lens and the size of image is twice the size of the object, then where was the object placed?
Official answer
The given figure shows image formation by a lens. Analyse the figure and answer the following questions: (a) What is the type of lens used for image formation in the given ray diagram? (b) If the real image is formed at a distance of from the lens and the size of image is twice the size of the object, then where was the object placed?
Marking scheme
- 1.(a) Convex lens
- 2.(b) Object distance = 15 cm
Hint
Analyze the direction of the rays after passing through the lens to determine the type of lens used. Use the lens equation and magnification formula to find the position of the object.
Quick oral answer
The type of lens used for image formation in the given ray diagram is a convex lens. The object distance can be calculated using the lens equation and magnification formula, which gives an object distance of 15 cm.
Common mistakes
- 1.assuming the lens is concave
- 2.not using the correct formulas
Analysis and explanation
The given figure shows image formation by a lens. The direction of the rays after passing through the lens indicates that the lens is convex. The lens equation can be used to find the position of the object, and the magnification formula can be used to calculate the object distance.
Interesting facts
Convex lenses are commonly used in optical instruments such as microscopes and telescopes.
The lens equation can be used to calculate the focal length of a lens.
Question details
Q33 of 39 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2026
- Section
- Section C
- Marks
- 2
- Type
- Very Short Answer
- Chapter
- Light — Reflection and Refraction
- Topic
- Image Formation by Lenses
- Bloom's level
- Comprehension
- Syllabus topic
- Refraction of Light
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2026?
This question carries 2 marks in the CBSE Class 10 Science 2026 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 Lenses" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2026 paper?
This is a Very Short Answer question from Section C in the CBSE Class 10 Science 2026 paper.