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Q.

The distance between the optical centre and point of convergence is called focal length in which of the following cases?


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a

(a)

b

(b)

c

(c)

d

(d)   

answer is C.

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Detailed Solution

The distance between the optical centre and the point of convergence is called focal length in the (c) case.
Because parallel rays, after reflection, meet at the focus of a convex lens. Focus is a point on the principal axis where convergent or divergent rays appear to meet.
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The distance between the optical centre and point of convergence is called focal length in which of the following cases?