Question

One half of a convex lens is covered with a black paper.

(a) Show the formation of image of an object placed at 2F1, of such covered lens with the help of ray

diagram. Mention the position and nature of 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 the image obtained in the two cases? Give reason for your ​

Answer 1

Answer:

When, the one half of the convex lens is covered with a black paper, the lens will still produces an image of the complete object but the intensity of the image will be reduced on covering with black paper,

diagram will be as follows:

(b)(i) object size=5cm

Object distance, u = 25 cm

Focal length, f = 10 cm

The ray diagram will be as follows:

(ii) Image distance, v =?

Object distance, u = -25 cm

Image size, h1 = 5cm

Image size, h2=?

Applying the lens formula:

Or, v = +16.6 cm

(iii) Nature of the image will be as follows:

Since, V is positive, which means that the image is real

The height of image, hy is negative, which means that the image is inverted

Explanation:

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