Question

One half of the convex lens is covered with a black paper. Show the formation of images of objects place of 2f1 of such covered lens with the help of ray diagram. Mention the position and nature of images

Answer 1

a) 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

Answer 2

Every part of a lens forms an image. Therefore, if the lower half of the lens is covered, it will still form a complete inverted image at 2F2 of the same size on the other side of the lens. However, the intensity of the image will be reduced.

The ray diagram is attached below:

Hope it helps you...

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