(a) One-half of a convex lens is covered with a black paper

CBSE Class 10 CBSE Class 10 Science
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1

(a) One-half of a convex lens is covered with a black paper. Will such a lens produce an image of the complete object? Support your answer with a ray diagram.
(b) An object 5 cm high is held 25 cm away from a converging lens of focal length 10 cm.

  1. Draw the ray diagram and
  2. Calculate the position and size of the image formed.
  3. What is the nature of the image?
2

(a) The image is formed by a large number of rays from the object. So, even if one half of the lens is darkened, the image will form. However, the brightness of the image will be less as compared to that of the image formed without wrapping the lens.

image

(b) image

image

(iii) Negative sign indicates that the image is real and inverted.