Question

Comment on the size, position of the image formed by a concave mirror of focal length 18 cm when an object is placed: 

(i) at 22 cm 

(ii) 14 cm 

(ii) 40 cm. 

in front of mirror without calculations.

Answer 1

(i) When the object is placed at 22 cm, the image is formed beyond 36 cm, real, inverted image is magnified. 

(ii) When the object is at 14 cm then the image formed is virtual, behind the mirror and magnified. 

(iii) When the object is placed beyond 40 cm, then the image is formed between 18 cm and 36 cm, it is real inverted and diminished image.