Q. 375.0( 3 Votes )

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Answer :

(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.


The ray 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, h2 is negative, which means that the image is inverted.


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