A square card of side length 1 mm is being seen through a magnifying lens of focal length of focal length 10 cm. The card is placed at a distance of 9cm from the lens. The card is placed at a distance of 9 cm from the lens. The apparent area of the card through the lens is :
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
: Area of a square card = 1 mm ×1 mm = 1 
Focal length of magnifying lens (converging lens),
F = + 10 cm
Object distance, u = - 9 cm
According to thin lens formula
or 
magnification, 
Apparent area of the card through the lens
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