A square 
of side 1 mm is kept at distance 15 cm infront of the concave mirror as shown in the figure. The focal length of the mirror is 10 cm. The length of the perimeter of its image will be (nearly):
Text Solution
Verified by ExpertsThe correct answer is:
C
By mirror formula,
So, 
Let 
and 
be image of AB and CD respectively.
Let 
and 
be image of BC and AD respectively.
∴ length 
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