One half of a convex lens is covered with black paper.
(a) Show the formation of image of a object placed at 2F, of such
covered lens with the help of ray diagram. Mention the position and
nature of the image.
(b) Draw the ray diagram for same object at same position in front of
the same lens, but now uncovered. Will there be any difference in
image obtained in the two cases ? Give reasons for your answers.
Answers
Answer:
Given :
One half of a convex lens is covered object placed at 2F, of such covered lens with the help of ray diagram.
with black paper. (a) Show the formation of image of a
In this case, light rays incident on lens will be refracted from the upper part of lens. These rays will meet at other side of the lens to form a image.
Nature of image :
Object is placed at 2F. we get image at 2F
of same size real and inverted.
2] Refer attachment for ray diagram In Both cases Complete image will be formed but intensity of the image will be reduced as the light falling on the lower portion will not reach the position of image.
Answer:
Complete image will be formed when the one half of a convex lens is covered with a black paper. Basically the other half refract to form the final image.
Full images are formed in both the cases. It is just the intensity of the image which is different. The intensity of image in Case 1 will be half of Case 2
