Physics
What happens to the size and intensity of the image if a part of a lens is covered ?
Answer
When a part of a lens is covered, every point of the remaining uncovered portion still contributes to forming the complete image. Therefore, the size and position of the image remain unchanged because these depend on the focal length and object distance, not on the aperture of the lens.
However, since less light passes through the lens, the intensity (brightness) of the image decreases.
Related Questions
Define the term principal foci of a convex lens and illustrate your answer with the aid of proper diagrams.
Define the term principal foci of a concave lens and show them with the help of proper diagrams.
Draw a diagram to represent the second focus of a concave lens.
Draw a diagram to represent the second focus of a convex lens.