A candle placed 
from a lens forms an image on a screen placed 
on the other side of the lens. The focal length and type of the lens should be
A
and convex lens
B
and concave lens
C
and convex lens
D
and concave lens
Text Solution
Verified by ExpertsThe correct answer is:
A
: Here, as per the Cartesian sign convention,
Object distance, 
Image distance, 
(as image is real)
According to thin lens formula
Since 
is positive, the lens should be convex lens.
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