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An object starts ,moving at an angle of 45⁰ with the principal axis as shown in fig. in front of a biconvex lens of focal length + 10cm. If $θ = \frac{- π}{n}$ denotes the angle at which image starts to move with principal axis then n is

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answer is 4.

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Detailed Solution

Object is at 2f, so image is also formed at 2f $V_{Iy} = V_{Oy} and V_{Ix} = V_{Ox}$

$\Rightarrow θ = \frac{- π}{4}$

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