Question

the valve of the focal length of the lens is equal to the valueof the image distance when the ray are​

Answer 1

Answer:

When the object is placed at infinity, i.e., when the rays are parallel to the principal axis, the value of focal length is equal to the value of the image distance.

i.e., object distance , u=∞

From lens formula,

1/f=1/u+1/v

1/f=1/infinity+1/v

f=v

i.e., image distance is equal to focal length of the lens.

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Answer 2

Answer:

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