An object is placed at the focus of concave lens having focal length f . What is the magnification and distance of the image from the optical centre of the lens?

Question

An object is placed at the focus of concave lens having focal length f . What is the magnification and distance of the image from the optical centre of the lens?, 1 4 , f 4, 1 2 , f 2, Very high, ∞, 1 , ∞

MARKS App · Accepted Answer

1 F = 1 v - 1 u Put u = - f and F = - f 1 - f = 1 v - 1 - f ; - 1 f = 1 f - 1 v ; - 2 f = 1 v ⇒ v = - f 2 Magnification = v / u = - f 2 ( - f ) = 1 2

Search any question & find its solution

Looking for more such questions to practice?