What is meant by power of lens? Write its s.i unit A student uses a lens of focal length 40cm and another of -20cm .write the nature and power of each lens?
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Heya.!
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Power of lens : The reciprocal of focal length is power lens.
S.I unit : Diaptore.
focal length (f¹) =40cm =40/100 m (changing focal length into meters ).
focal length (f²) = -20cm = -20/100 m
=> P=1/f¹
P =1/40/100
P=100/40
P=2.5 D.
=> P=1/f²
P = 1/-20/100
P =100/-20
P = -5D.
Nature of lens whose focal length is 40 cm is virtual and erect
Nature of lens whose focal length is -20cm is real and inverted.
# HOPE IT HELPS #
____________________☺
_______________________
Power of lens : The reciprocal of focal length is power lens.
S.I unit : Diaptore.
focal length (f¹) =40cm =40/100 m (changing focal length into meters ).
focal length (f²) = -20cm = -20/100 m
=> P=1/f¹
P =1/40/100
P=100/40
P=2.5 D.
=> P=1/f²
P = 1/-20/100
P =100/-20
P = -5D.
Nature of lens whose focal length is 40 cm is virtual and erect
Nature of lens whose focal length is -20cm is real and inverted.
# HOPE IT HELPS #
____________________☺
it's dioptre....
yep...d indicates diaptore
the spelling is dioptre
ok...dioptre
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