pinhole

«pinhole» in Mova's school dictionary: a very small hole, like one made by a pin — its meaning for a pupil, its sense in the lessons and examples, with 2 sentences of Mova's corpora that use it.

part of speech

noun (a pinhole, pinholes); adjective (pinhole camera)

meaning for a pupil

1) A pinhole is a very small hole, like one made by a pin. tree →

2) A pinhole camera is a simple camera made from a box with a tiny hole, and no lens, that makes an upside-down picture inside. tree →

sense in the lessons

In science lessons about light, pupils make a pinhole camera from a box or tube with tracing paper at the back: light travels in straight lines through the pinhole, so the picture appears upside down. During a solar eclipse, people use a pinhole viewer to look at the sun safely, never looking straight at it. Phrases: «pinhole camera», «pinhole viewer».

examples

• We made a pinhole camera from a shoebox. tree →
• The picture in the pinhole camera was upside down. tree →
• Light shone through a pinhole in the curtain. tree →
• Use a pinhole viewer to watch the eclipse safely. tree →
• A pinhole in the tyre let the air out slowly. tree →
• Light travels in straight lines through the pinhole. tree →

note

Countable; one word. Safety: never look at the sun directly, not even through a pinhole; a pinhole viewer projects the image onto paper. The picture is upside down because light rays cross at the hole.

In the corpora

• An eclipse of the Sun is watched only with special eclipse glasses or a pinhole projector.
• Never look at a solar eclipse with bare eyes or ordinary sunglasses; use proper eclipse glasses or a pinhole projector.

Trees and pragmatics

Every meaning and example of «pinhole» parsed by Mova, each sentence with its dependency tree and frames.