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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.

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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 happened when a hand was held in the beam?
  2. 2. What does this record not tell you?
  3. 3. What would happen with a third mirror added at an angle?
  4. 4. Why could nothing be seen with the flashlight off?
2.A hand held in a flashlight beam makes a dark patch behind it. What does that show?
  • A.The flashlight turned off
  • B.The hand soaks up all the air
  • C.Light travels in straight lines and the hand blocks it
3.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
4.Why can you not see around a corner without a mirror?
  • A.Your eyes cannot move
  • B.Corners are too dark
  • C.Light travels in straight lines and does not turn the corner by itself
5.A cyclist's reflector shines in a car's headlights. Why?
  • A.It has its own battery
  • B.It reflects the headlight beam back toward the driver
  • C.It is hot
6.What must happen for you to see the moon at night?
  • A.Your eyes must shine on it
  • B.The moon must make its own light
  • C.Sunlight must reflect off the moon and reach your eyes
7.What does a mirror do to light that hits it?
  • A.It makes more light
  • B.It reflects it off in a new direction
  • C.It soaks it up

LessonPrint · 4-PS4-2 · Set 25 · free to copy for classroom use

Answer key — Around the Corner With Two Mirrors

Set 25. Prints on its own sheet.

  1. 1.1. The card went dark. 2. It does not tell you how bright the card was each time. 3. The light path would turn again before reaching the card. 4. No light traveled to the card and back to the eye.
  2. 2.Light travels in straight lines and the hand blocks it
  3. 3.No light is reflecting off it into your eyes
  4. 4.Light travels in straight lines and does not turn the corner by itself
  5. 5.It reflects the headlight beam back toward the driver
  6. 6.Sunlight must reflect off the moon and reach your eyes
  7. 7.It reflects it off in a new direction

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