a thin lens has a focal length of -25 what is the power of lens ?is it convex or concave
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Answered by
20
solution
power = 1/f (in meter)
= -100/ 25
= -4D
The lens is concave .
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☺
power = 1/f (in meter)
= -100/ 25
= -4D
The lens is concave .
=============
☺
Answered by
11
Heya !
Here you go !
When the focal length of a lense becomes negative, then the lense will be concave, when positive it will be convex lens.
So, a lens of focal length -25 is concave .
P= 1/f (in m )
=100/-25= -4
Hence -4 D is the power.
Here you go !
When the focal length of a lense becomes negative, then the lense will be concave, when positive it will be convex lens.
So, a lens of focal length -25 is concave .
P= 1/f (in m )
=100/-25= -4
Hence -4 D is the power.
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