Quick Answer:The Pinhole Camera is a light-proof wooden camera made of two sliding boxes, with a drilled pinhole at one end and a frosted glass screen at the other on which an inverted image forms; it measures 100mm x 200mm fully extended.
Last updated: 18 October 2026
Key Features
Light-proof seasoned wood body.
Two boxes slide inside each other to change the image distance.
Frosted glass viewing screen.
Drilled pinhole aperture; no lens.
Technical Specifications
Specification
Value
Material
Seasoned wood, light-proof
Body
Two sliding boxes for focal adjustment
Screen
Frosted glass
Aperture
Drilled pinhole
Size
100mm x 200mm (fully extended)
How It Is Used
Pointed at a bright window or lamp, the camera forms an inverted image on the frosted screen, showing that light travels in straight lines. Sliding the inner box in or out changes the distance from pinhole to screen, so students can see how the image grows or shrinks with that distance.
Frequently Asked Questions
Why is the image in the Pinhole Camera upside down?
Light travels in straight lines, so rays from the top of the object pass through the pinhole and reach the bottom of the frosted screen, and rays from the bottom reach the top. No lens is involved.
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