Light, Shadows & Reflection — Practice · Grade 6 Science
Chapter: Electricity, Magnetism & LightWhat this practice covers
By the end of Light, Shadows & Reflection you should be able to:
- I can use straight-line travel to explain the size and sharpness of a shadow.
- I can apply the law of reflection to predict where a reflected ray goes.
- I can explain why a mirror shows an image and a matt wall does not.
8 questions, written answer and multiple choice, each with a worked explanation.
Vocabulary used: normal, reflection, evidence, system boundary, uncertainty.
Problem 1
Answer and explanation
No. Light from the source reaches the page and some reflected light enters the eye.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 2
Answer and explanation
The geometry changes which diverging light paths are blocked before reaching the screen.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 3
Answer and explanation
The reflected angle measured from the same normal, not the angle from the mirror surface.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 4
Answer and explanation
Its surface scatters reflected light toward many directions rather than preserving one sharp organized image.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 5
Answer and explanation
The correct reflected angle is 40° from the normal and 50° from the surface. Drawing 40° from the surface makes it 50° from the normal, so the mismatch comes from the reference line. These are ideal ray-model angles, not a record of an actual mirror trial.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 6
Answer and explanation
No. Source–object–screen distances and source size affect shadow geometry. Check those conditions before claiming a change in the object.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 7
- A visible object must generate its own light.
- Reflection angles are defined from the surface rather than the normal.
- normal: A line perpendicular to a surface at the point being considered.
- One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation
normal: A line perpendicular to a surface at the point being considered.
A line perpendicular to a surface at the point being considered. The correct reflected angle is 40° from the normal and 50° from the surface. Drawing 40° from the surface makes it 50° from the normal, so the mismatch comes from the reference line. These are ideal ray-model angles, not a record of an actual mirror trial.
Problem 8
- One illustrative result establishes every real condition and needs no further evidence.
- Reflection angles are defined from the surface rather than the normal.
- A visible object must generate its own light.
- reflection: Light being redirected from a surface.
Answer and explanation
reflection: Light being redirected from a surface.
Light being redirected from a surface. The correct reflected angle is 40° from the normal and 50° from the surface. Drawing 40° from the surface makes it 50° from the normal, so the mismatch comes from the reference line. These are ideal ray-model angles, not a record of an actual mirror trial.