Physics
State the condition for each of the following :
(a) a lens has both its focal lengths equal.
(b) a ray passes undeviated through the lens.
Refraction Lens
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Answer
(a) When the medium is the same on either side of the lens then it has both its focal lengths equal.
(b) A ray passes undeviated through the lens, when it is incident at the optical centre of the lens.
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