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  • An object is placed in front of a concave mirror of focal length of 12 cm. There are two possible positions of the object for which the image formed is three times the size of the object. (a) Draw the ray diagram for the each case, and

An object is placed in front of a concave mirror of focal length of 12 cm. There are two possible positions of the object for which the image formed is three times the size of the object.

(a) Draw the ray diagram for the each case, and

(b) Find the distance between the two positions of the object.

 

 
 
 
 
 

Answers (1)

a)  

b) 

m=-3

v=3u

1/v+1/u=1/f

\\1/3u+1/u=1/-12\\u=-16cm

Case 2

m=+3

v=-3u

1/v+1/u=1/f

\\1/(-3u)+1/u=1/-12\\u=-8cm

distance between two positions=8 cm

Posted by

Safeer PP

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