Light Energy — Flashcards
ICSE · Class 7 · Physics
34 flashcards for Light Energy (ICSE Class 7 Physics) to test yourself on key terms and facts. Sample: "State the definition of reflection of light."
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State the definition of reflection of light.
Answer
Reflection of light is the returning of light in the same medium after striking a surface.
What is the angle of incidence?
Answer
The angle of incidence is the angle between the incident ray and the normal at the point of incidence. It is denoted by i.
What is the angle of reflection?
Answer
The angle of reflection is the angle between the reflected ray and the normal at the point of incidence. It is denoted by r.
State the law of reflection.
Answer
Law of reflection: i = r Meaning: the angle of incidence is equal to the angle of reflection. Units: angles are measured in degrees (°). Quick example: if i = 35°, then r = 35°.
State the second law of reflection.
Answer
The incident ray, the reflected ray and the normal all lie in the same plane.
A ray is incident normally on a plane mirror. Find the angle of incidence and the angle of reflection.
Answer
Given: the ray is incident normally on the plane mirror. Step 1: A normal incidence means the ray travels along the normal. Step 2: Angle of incidence i = 0°. Step 3: By the law of reflection, r = i =…
A light ray is incident on a plane mirror with an angle of incidence of 40°. Find the angle of reflection.
Answer
Given: i = 40° Formula: i = r Step 1: Substitute the value. Step 2: r = 40° Answer: The angle of reflection is 40°.
Why does a plane mirror form a virtual image?
Answer
A plane mirror forms a virtual image because the reflected rays do not actually meet behind the mirror. They only appear to come from a point behind the mirror, so the image cannot be obtained on a sc…
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