Light Energy — Flashcards
ICSE · Class 8 · Physics
36 flashcards for Light Energy (ICSE Class 8 Physics) to test yourself on key terms and facts. Sample: "State the definition of refraction of light."
Interactive on Super Tutor
Studying Light Energy? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for flashcards and more.
Free trial, no card needed.
One of 5 illustrations for Light Energy in Super Tutor — alongside flashcards, concept maps and practice questions.
State the definition of refraction of light.
Answer
Refraction of light is the change in direction of the path of light when it passes from one optically transparent medium to another.
Why does light bend towards the normal when it goes from air to water or glass?
Answer
Air is optically rarer than water and glass. When light travels from a rarer medium to a denser medium, it bends towards the normal. Example: light entering water from air bends towards the normal.
Why does light bend away from the normal when it goes from glass to air?
Answer
Glass is denser than air. When light travels from a denser medium to a rarer medium, it bends away from the normal. Example: light leaving a glass block into air bends away from the normal.
A ray of light falls normally on a boundary between two media. What happens?
Answer
It passes undeviated, along the same path, because the angle of incidence is zero.
A ray of light passes from air to water. Given speeds 3 × 10^8 m/s in air and 2.25 × 10^8 m/s in water, find the refractive index of water with respect to air.
Answer
Given: speed in air = 3 × 10^8 m/s, speed in water = 2.25 × 10^8 m/s. Formula: μ = speed of light in first medium / speed of light in second medium. Calculation: μ = (3 × 10^8) / (2.25 × 10^8) = 4/3 =…
A ray of light passes from air to glass. Given speeds 3 × 10^8 m/s in air and 2 × 10^8 m/s in glass, find the refractive index of glass with respect to air.
Answer
Given: speed in air = 3 × 10^8 m/s, speed in glass = 2 × 10^8 m/s. Formula: μ = speed of light in first medium / speed of light in second medium. Calculation: μ = (3 × 10^8) / (2 × 10^8) = 1.5. Answer…
State Snell's law of refraction.
Answer
Snell's law: sin i / sin r = constant, where i is the angle of incidence and r is the angle of refraction.
A ray of light passes from one medium to another with the same refractive index. What happens to the ray?
Answer
It remains undeviated because both media have the same refractive index.
+28 more flashcards
Practise AllFrequently Asked Questions
What are the important topics in Light Energy for ICSE Class 8 Physics?
How many flashcards are available for Light Energy?
How should I revise Light Energy for Class 8 exams?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Light Energy
Practice Quiz
Test yourself with a quick quiz
Important Questions
Exam-style questions with answers
Revision Notes
Key points for last-minute revision
Formula Sheet
The chapter's formulas in one place
Chapter Summary
Understand the chapter at a glance
Concept Maps
See how topics connect
Study Plan
Step-by-step plan for this chapter
Syllabus
What topics to cover
For serious students
Get the full Light Energy chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for ICSE Class 8 Physics. Free to start, no card needed.