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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. Why could nothing be seen with the flashlight off?
  2. 2. What happened when a hand was held in the beam?
  3. 3. What does this record not tell you?
  4. 4. What would happen with a third mirror added at an angle?
2.A still pond shows a clear reflection, but a rippled one does not. Why?
  • A.Still water is a mirror made of glass
  • B.Ripples make the water darker
  • C.Smooth water reflects light evenly, and ripples send it off in many directions
3.In a dark room with no light at all, you cannot see a white cup. Why?
  • A.The cup is too far away
  • B.No light is reflecting off it into your eyes
  • C.White cups are invisible
4.A cyclist's reflector shines in a car's headlights. Why?
  • A.It is hot
  • B.It has its own battery
  • C.It reflects the headlight beam back toward the driver
5.Why does a periscope have its mirrors tilted?
  • A.So it looks interesting
  • B.So the mirrors do not fall out
  • C.So light from above is turned down the tube and then into the eye
6.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
7.Why can you not see around a corner without a mirror?
  • A.Light travels in straight lines and does not turn the corner by itself
  • B.Your eyes cannot move
  • C.Corners are too dark

LessonPrint · 4-PS4-2 · Set 15 · free to copy for classroom use

Answer key — Around the Corner With Two Mirrors

Set 15. Prints on its own sheet.

  1. 1.1. No light traveled to the card and back to the eye. 2. The card went dark. 3. It does not tell you how bright the card was each time. 4. The light path would turn again before reaching the card.
  2. 2.Smooth water reflects light evenly, and ripples send it off in many directions
  3. 3.No light is reflecting off it into your eyes
  4. 4.It reflects the headlight beam back toward the driver
  5. 5.So light from above is turned down the tube and then into the eye
  6. 6.Sunlight must reflect off the moon and reach your eyes
  7. 7.Light travels in straight lines and does not turn the corner by itself

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