why does a lens have two primary focus
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A principal focus or focal point is a special focus: For a lens, or a spherical or parabolic mirror, it is a point onto which collimated light parallel to the axis is focused. Since light can pass through a lens in either direction, alens has two focal points – one on each side.
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As the lens is made up of transparent material, therefore, light can pass through it in both directions. As a result, there are two principal foci at equal distances from the optical centre of the lens, provided the medium on either side of the lens.
These are known as first focal point (or first focus) and the second focal point (or second focus).
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Here is your answer
________________________________________________
As the lens is made up of transparent material, therefore, light can pass through it in both directions. As a result, there are two principal foci at equal distances from the optical centre of the lens, provided the medium on either side of the lens.
These are known as first focal point (or first focus) and the second focal point (or second focus).
⭐Hope it helps you⭐
☺️ Thank you☺️
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