A person of height 1.8 standing at the centre of a room having equal dimensions of 10 m wishes
to see the full image of the back wall in the mirror fixed on the front wall. The minimum height
of the plane mirror needed for this purpose is
 
  • a)
    0.9 m
  • b)
    1.8 m
  • c)
    10/3 m
  • d)
    10 m
Correct answer is option 'C'. Can you explain this answer?
Related Test: Test: Ray Optics - 2

Class 10 Question

2 Answers
Cjseven Ufo answered Jun 23, 2020

Rubani Gulati answered Aug 07, 2018
In this ray diagram h is the height of the man. 

Form this ray diagram we can see that the minimum height of the plane mirror is 90 cm, so that the man can see his full image. ( which is equal to half of the height of the man)

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