Soumen's teacher asked their class to make a pinhole camera by themselves. Soumen read the
activity 5 given in his textbook on how to make a pinhole camera. But he was unable to get the
image of a well-lit object. He was very upset. His elder brother on observing his pinhole camera
found that the hole made by him was quite large. He rectified Soumen's mistake and helped him
making another pinhole camera. Now, Soumen can see the image of the object.
(4)
(a) On which principle of light does a pinhole camera works?
(b) Why was Soumen unable to get the image of a well lit object?
(c) How does the formation of the image by a pinhole camera is affected by size of the hole?
(d) What values of Soumen is shown here?
Answers
Answer:
Its all the game of intensity, we know intensity= energy/area. when area of whole was large ultimately intensity will be less, as intensity is inversely proportional to area. and when souman reduced the whole size (area) he got more intensity comparatively .
Answer:
(a)On principle of straight line
(b) Because of the bigger hole for the entrance of light.
(c)Increased size decrease the sharpness of obtained image.
(d)Enthusiastic and determined.
Explanation:
(a) The pinhole camera works on the rectilinear theory of light which states that the light travels in straight line.
(b) Soumen was unable to get the well lit image because he made the entrance hole quite bigger than the required, which eventually decreases the sharpness of the image as more light started entering into the camera.
(c) The formation of the image get disturbed when the size of the hole increases as it leads to the entrance of more sunlight which eventually enhances the quantity of the light in the box hence, leads to the formation of thick and blurry image (diminished and very less sharp image).
(d) As teacher asked the class to make a pin-hole camera by themselves, Souman took the initiative of making it the day itself this shows that he is enthusiastic and he made it with an error which shows that he is determined and hard-working too.
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