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  • (a) List four characteristics of the image formed by a convex lens when an object is placed between its optical centre and principal focus. (b) Size of the image of an object by a concave lens of focal length <img alt="20 \; cm" src="https://

(a) List four characteristics of the image formed by a convex lens when an object is placed between its optical centre and principal focus.

(b) Size of the image of an object by a concave lens of focal length 20 \; cm is observed to be reduced to  \frac{1}{3}rd of its size. Find the distance of the object from the lens.

 

 

 

 
 
 
 
 

Answers (1)

(a) Characteristics of image formed by convex lens when an object placed b/w its optical centre and principal focus.

(i) Image formed on the same side of lens as the object.

(ii) The Image is enlarged / magnified

(iii) The Image is Erect

(iv) The image is virtual.

(b) {h}'=\frac{h}{3},\; \; \; focal \; length=20 \; cm 

        as per lens formula \frac{1}{v}-\frac{1}{u}=\frac{1}{f}

        u=-40\; cm

Posted by

Sumit Saini

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