Find the focal lengtlength of a lens power -2.0 D .what type of lens is this?
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As per the formula of power of lens
P = 1/f (in meters)
So here we are given the power of the lens and we have to find the focal length so we will use the same formula as above.
P= 1/f
f = 1/p
=1/-0.2
= -10/2
= -5 meters
So we got that focal length = -5 meters
As we have a -ve sign in our ans, so this denotes that the lens is concave lens and is used to correct myopia
P = 1/f (in meters)
So here we are given the power of the lens and we have to find the focal length so we will use the same formula as above.
P= 1/f
f = 1/p
=1/-0.2
= -10/2
= -5 meters
So we got that focal length = -5 meters
As we have a -ve sign in our ans, so this denotes that the lens is concave lens and is used to correct myopia
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