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Image Formation by Convex Lens

Where must an...

Question

Where must an object be placed in front of a convex lens so that the image formed is at infinity?

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Solution

When the object is placed at focus the rays appear to form a virtual image at infinity.

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Q. Where must an object placed in front of a converging lens so that the image formed may be at infinity?

Q. Where must an object be placed in front of a convex lens so that the image formed is upright and enlarged image?

In each of the following cases, where must an object be placed in front of a convex lens so that the image formed is

(a) at infinity,

(b) of same size as the object,

(c) inverted and enlarged,

(d) upright and enlarged ?

Q. Where must an object be placed in front of a convex lens so that the image formed is of same size as the object :

(Given focal length for lens

= F

Q. Where must an object placed in front of a converging lens so that the image formed may be inverted and enlarged?

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