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  • (a) List four characteristics of the images formed by plane mirrors. (b) A tall object is placed at a distance of <img alt="20\; cm" src="https:

(a) List four characteristics of the images formed by plane mirrors.

(b) A 5\; cm tall object is placed at a distance of 20\; cm from a concave mirror of focal length 30\; cm. Use mirror formula to determine the position and size of the image formed.

 

 

 

 
 
 
 
 

Answers (1)

(a) Characteristics -

(i) Size of the image is equal to the size of object.

(ii) Image formed by a plane mirror is always erect and virtual.

(iii) Image is formed behind the mirror and distance between image from mirror is same as the distance of object from mirror.

(iv) The image os laterally inverted.

(b) u=-20\; cm,\;\; \; \; f=-30\; cm,\;\; \; \; h=5\; cm

\frac{1}{f}=\frac{1}{v}+\frac{1}{u}

\frac{1}{v}=\frac{-1}{30}+\frac{1}{-20}

\Rightarrow v=-60\; cm

\frac{{h}'}{h}=\frac{v}{u}

{h}'=\frac{v}{u}\times h

{h}'=\frac{-60}{-20}\times 5

{h}'=15\; cm

size = Enlarged

 

Posted by

Sumit Saini

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