A student traces the path of a ray of white light through a rectangular glass slab and marks, the angles of incidence (∠i), refraction (∠r) and emergence (∠e) as shown. Which angle or angles has he not marked correctly ?
A student traces the path of a ray of white light through a rectangular glass slab and marks, the angles of incidence (∠i), refraction (∠r) and emergence (∠e) as shown. Which angle or angles has he not marked correctly ?
Options
The student has not marked the angles of incidence (∠i) and emergence (∠e) correctly. The angle of incidence is the angle between the incident ray and the normal to the surface, while the angle of emergence is the angle between the emergent ray and the normal to the surface. In this case, the student has marked the angle of incidence as ∠i, but it should be the angle between the incident ray and the normal to the surface. Similarly, the angle of emergence is marked as ∠e, but it should be the angle between the emergent ray and the normal to the surface.
Marking Scheme
- 1The student has not marked the angles of incidence (∠i) and emergence (∠e) correctly.
- 2The angle of incidence is the angle between the incident ray and the normal to the surface.
- 3The angle of emergence is the angle between the emergent ray and the normal to the surface.
Hint
To solve this question, the student needs to carefully examine the diagram and identify the correct angles of incidence and emergence. They should also recall the concept of refraction and how it affects the path of light as it passes through a medium with a different optical density.
Quick Oral Answer
The student has not marked the angles of incidence (∠i) and emergence (∠e) correctly. The angle of incidence is the angle between the incident ray and the normal to the surface, while the angle of emergence is the angle between the emergent ray and the normal to the surface. In this case, the student has marked the angle of incidence as ∠i, but it should be the angle between the incident ray and the normal to the surface. Similarly, the angle of emergence is marked as ∠e, but it should be the angle between the emergent ray and the normal to the surface.
Analysis & Explanation
This question requires the student to analyze the path of a ray of white light through a rectangular glass slab and identify the correct angles of incidence and emergence. The student needs to understand the concept of refraction and how it affects the path of light as it passes through a medium with a different optical density. By examining the diagram, the student can determine that the angle of incidence is not correctly marked as ∠i, and the angle of emergence is not correctly marked as ∠e. This question assesses the student's ability to apply their knowledge of refraction to a specific scenario and identify the correct angles.
Common Mistakes
- 1Marking the angle of incidence as ∠i instead of the angle between the incident ray and the normal to the surface.
- 2Marking the angle of emergence as ∠e instead of the angle between the emergent ray and the normal to the surface.
Interesting Facts
Refraction is the bending of light as it passes from one medium to another with a different optical density.
The angle of incidence and the angle of emergence are important concepts in understanding the behavior of light as it passes through different media.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2012?
This question carries 1 mark in the CBSE Class 10 Science 2012 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 "Refraction" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2012 paper?
This is a MCQ question from Section B in the CBSE Class 10 Science 2012 paper.