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Around the Corner With Two Mirrors is a free printable Grade 4 science worksheet on using a mirror test to model how reflected light reaches the eye, aligned to NGSS performance expectation 4-PS4-2. It prints 7 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 20 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Around the Corner With Two Mirrors

4-PS4-2

NameDate

Read the record, then answer the questions.

1.Read the record, then answer the questions.

Around the Corner With Two Mirrors

What the class saw when a flashlight beam was aimed into a tube with two angled mirrors. THE PERISCOPE TUBE Flashlight on, both mirrors in place: the card at the far end was lit Flashlight on, top mirror removed: the card was not lit Flashlight off, both mirrors in place: nothing could be seen A hand held in the beam: the card went dark The card never moved.

  1. 1. What would happen with a third mirror added at an angle?
  2. 2. What happened when the top mirror was removed?
  3. 3. What claim does this record support?
  4. 4. What did the card need before it could be seen?
2.Why does a periscope have its mirrors tilted?
  • A.So light from above is turned down the tube and then into the eye
  • B.So it looks interesting
  • C.So the mirrors do not fall out
3.A cyclist's reflector shines in a car's headlights. Why?
  • A.It reflects the headlight beam back toward the driver
  • B.It is hot
  • C.It has its own battery
4.In a dark room with no light at all, you cannot see a white cup. Why?
  • A.No light is reflecting off it into your eyes
  • B.The cup is too far away
  • C.White cups are invisible
5.A hand held in a flashlight beam makes a dark patch behind it. What does that show?
  • A.Light travels in straight lines and the hand blocks it
  • B.The flashlight turned off
  • C.The hand soaks up all the air
6.Why can you not see around a corner without a mirror?
  • A.Corners are too dark
  • B.Your eyes cannot move
  • C.Light travels in straight lines and does not turn the corner by itself
7.What must happen for you to see the moon at night?
  • A.Sunlight must reflect off the moon and reach your eyes
  • B.The moon must make its own light
  • C.Your eyes must shine on it

LessonPrint · 4-PS4-2 · Set 20 · free to copy for classroom use

Answer key — Around the Corner With Two Mirrors

Set 20. Prints on its own sheet.

  1. 1.1. The light path would turn again before reaching the card. 2. The card was not lit. 3. Light travels a path, reflects off mirrors, and must enter the eye for something to be seen. 4. Light reaching it along the path through both mirrors.
  2. 2.So light from above is turned down the tube and then into the eye
  3. 3.It reflects the headlight beam back toward the driver
  4. 4.No light is reflecting off it into your eyes
  5. 5.Light travels in straight lines and the hand blocks it
  6. 6.Light travels in straight lines and does not turn the corner by itself
  7. 7.Sunlight must reflect off the moon and reach your eyes

Last reviewed 2026-09-05. Aligned to 4-PS4-2 of the Next Generation Science Standards.