is the image formed by a lens for all positions of an object placed in front of it is always erect and diminished what is the nature of this lens? Draw a ray diagram to justify your answer question mark in the numerical value of the power of this lens is 10 diopter what is its focal length in the Criterion system ?
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in front of eye disease is myopia
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It is a concave lens.
Power of lens = 10 D
P=1/f [in metres]
f=1/P
f=1/10
f=0.1m
So focal length = -10 cm
Negative sign indicates concave lens.
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