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Question
Explain the formation of the image of a luminous object in a pinhole camera with the aid of a neat diagram.
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Solution
When a luminous object AB, such as a lighted candle, is placed in front of the pinhole, an inverted picture A’ B’ of the candle is
obtained on the tracing paper. This picture A’ B’ is called the image. The image obtained is upside down (i. e. inverted). The reason is that the light travels in a straight-line path. Hence light from the upper point A of the candle passes through the pinhole and strikes
the tracing paper at A’. Similarly, light from the lower point B of the candle passes through the pinhole and strikes the tracing paper
(or screen) at B’. Light from all the other points between A and B, on passing through the pinhole strikes the tracing paper in between
A’ and B’. As a result, an inverted image of the candle is seen on the tracing paper Fig shows the simple ray diagram for die formation of the image.
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RELATED QUESTIONS
Write true or false of the following statement.
Image formed in a pinhole camera is real.
What is a pinhole camera? Draw a neat and labelled diagram to show the formation of an image of a lighted candle by it.
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State the effect on the image in a pinhole camera if the hole is made bigger.
State the effect on the image in a pinhole camera if the luminous object is moved towards the pinhole.
State the effect on the image in a pinhole camera if The length of the pinhole camera is increased (length the screen is moved away from the pinhole).
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Pinhole camera is based on the ................... propagation of light.
Write true or false
Image formed in a pinhole camera is erect.
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