Reflection of Light — Flashcards
ICSE · Class 9 · Physics
37 flashcards for Reflection of Light (ICSE Class 9 Physics) to test yourself on key terms and facts. Part of the ICSE Class 9 Physics syllabus.
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State the definition of reflection of light.
Answer
Reflection of light is the return of light into the same medium after striking a surface.
What is regular reflection?
Answer
Regular reflection occurs when a beam of light falls on a smooth and polished surface, such as a plane mirror. The reflected rays go in a fixed direction.
What is irregular reflection?
Answer
Irregular reflection occurs when a beam of light falls on a rough surface such as the wall of a room or the page of a book. The reflected rays spread in different directions.
State the first law of reflection.
Answer
The angle of incidence i is equal to the angle of reflection r. In symbols, ∠i = ∠r.
State the second law of reflection.
Answer
The incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.
A ray is incident normally on a plane mirror. What happens to it?
Answer
For normal incidence, angle of incidence = 0°. So angle of reflection = 0°. The ray retraces its path along the same line.
A plane mirror is 3 cm thick glass plate. Which surface reflects light?
Answer
Light enters through the polished front surface, but strong reflection takes place from the back silvered surface. The back is coated with opaque material for protection.
What is a real image?
Answer
A real image is formed by actual intersection of reflected rays. It can be obtained on a screen and is always inverted.
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