A student focussed the image of a distant object using a device ‘X’ on a white screen ‘S’ as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device.
A student focussed the image of a distant object using a device ‘X’ on a white screen ‘S’ as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device.
Options
The device X is a concave mirror of focal length 40 cm.
Marking Scheme
- 1The device X is a concave mirror of focal length 40 cm.
Hint
The device X is a concave mirror because it converges light rays to form a real image on the screen S.
Quick Oral Answer
The device X is a concave mirror of focal length 40 cm.
Analysis & Explanation
This question requires the student to understand the properties of concave mirrors and how they form images. The student needs to analyze the given figure and identify the type of mirror used to form the image on the screen. The correct answer is based on the fact that the distance between the screen and the device is equal to the focal length of the concave mirror.
Common Mistakes
- 1The device X is a convex lens of focal length 20 cm.
- 2The device X is a convex lens of focal length 40 cm.
Interesting Facts
Concave mirrors are used in telescopes to magnify distant objects.
Concave mirrors can also be used to form virtual images.
Spotted a mistake or something unclear?
Tell us — we fix reported answers fast.
Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2013?
This question carries 1 mark in the CBSE Class 10 Science 2013 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 "Spherical Mirrors" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2013 paper?
This is a MCQ question from Section B in the CBSE Class 10 Science 2013 paper.