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An object is placed at a distance f/2 from a convex lens of focal length f. The image will be at a) 3f/2, real and inverted b) one of the foci, virtual, double the size of the object c) f/2, real and inverted d) f, virtual and erect

An object is placed at a distance f/2 from a convex lens of focal length f. The image will be at a) 3f/2, real and inverted b) one of the foci, virtual, double the size of the object c) f/2, real and inverted d) f, virtual and erect

Grade:upto college level

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
3 years ago
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Vikas TU
14149 Points
3 years ago
Given is convex lens.  (1/v) – (1/u) = (1/f) 
Here u = object distance = – (f/2) 
Hence (1/v) = (1/f) + (1/u) 
∴ (1/v) = (1/f) – (2/f)
  ∴ (1/v) = – (1/f) 
∴ v = – f 
∴ image is virtual, on the negative focal point, also image is double its size.

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