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Questions and Answers
What is the orientation of the image formed by a pinhole camera?
What is the orientation of the image formed by a pinhole camera?
- Upright
- Laterally inverted
- Vertically inverted
- Inverted (correct)
What happens to the image when the size of the pinhole increases?
What happens to the image when the size of the pinhole increases?
- The image remains unchanged
- The image becomes larger
- The image becomes clearer
- The image gets blurred (correct)
What is the advantage of a pinhole camera in terms of focusing?
What is the advantage of a pinhole camera in terms of focusing?
- It can only focus on close objects
- It has an infinite depth of focus (correct)
- It requires frequent adjustments
- It has a limited depth of focus
What is the reason for covering a pinhole camera with black cloth?
What is the reason for covering a pinhole camera with black cloth?
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What type of shadow is formed when an object is placed in the path of light from a point source?
What type of shadow is formed when an object is placed in the path of light from a point source?
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What occurs when the moon comes between the sun and the earth?
What occurs when the moon comes between the sun and the earth?
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Study Notes
Properties of Images Formed by a Pinhole Camera
- Image is diminished in size
- Image is inverted
- Image is real
- Image is not laterally inverted
- Image gets blurred as the size of the pinhole increases
Advantages of Pinhole Camera
- Infinite depth of focusing, resulting in clear images regardless of object distance
- No need for focusing adjustments
Disadvantages of Pinhole Camera
- Image formation takes a long time due to limited light entering the small pinhole
- Camera must be covered with black cloth to prevent light from entering through sides and edges
Formation of Shadows
- Opaque objects block light, resulting in darkness behind them
- Two types of shadows:
- Umbra: complete or total shadow formed when an object is placed in the path of light from a point source
- Penumbra: partial or incomplete shadow formed when an obstacle is placed in front of light from an extended source or distant source
Eclipse
- Occurs when the moon comes between the sun and earth or when the earth comes between the sun and the moon
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