Question 242 marksVery Short AnswerSection B

An object is placed at a distance of 10cm10\mathrm{cm} from a convex mirror of focal length 15cm15\mathrm{cm}. Find the position of the image formed by the mirror.

Chemical Reactions and Equations
Reflection of Light

Official answer

The image is formed at a distance of 6extcm6 ext{ cm} behind the mirror. It is a virtual and erect image.

Answer keywords:Mirror formulaConvex mirrorVirtual and erectBehind the mirror

Marking scheme

  1. 1.0.5 mark for stating the mirror formula correctly.
  2. 2.0.5 mark for correct substitution with signs.
  3. 3.0.5 mark for calculating the value of v.
  4. 4.0.5 mark for stating the position and nature of the image.

Hint

Remember the sign convention: uu is always negative, and for a convex mirror, ff is positive.

Quick oral answer

What is the nature of an image formed by a convex mirror for a real object? It is always virtual, erect, and diminished.

Common mistakes

  1. 1.Taking focal length (ff) as negative for a convex mirror.
  2. 2.Incorrectly adding fractions (e.g., 1/15+1/10=2/251/15 + 1/10 = 2/25).

Analysis and explanation

In this problem, we apply the mirror formula to a convex mirror. Unlike the chemical reactions discussed in the text which involve the breaking and making of bonds, optical phenomena involve the redirection of light. The sign convention is crucial: for a convex mirror, the focal length is always positive, and the image distance (vv) for a real object is always positive, resulting in a virtual image.

Interesting facts

Convex mirrors are preferred as rear-view mirrors in vehicles because they give an erect image and provide a wider field of view compared to plane mirrors.

Question details

Q24 of 39 questions

Board
CBSE
Class
Class 10
Subject
Science
Year
2024
Section
Section B
Marks
2
Type
Very Short Answer
Chapter
Chemical Reactions and Equations
Topic
Reflection of Light
Bloom's level
Applying
Syllabus topic
Light - Reflection and Refraction: Mirror Formula

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Frequently asked questions

How many marks does this question carry in CBSE Class 10 Science 2024?

This question carries 2 marks in the CBSE Class 10 Science 2024 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Chemical Reactions and Equations" 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 2024 paper?

This is a Very Short Answer question from Section B in the CBSE Class 10 Science 2024 paper.