Question

object at infinity, what is the distance in case of convex or concave
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Answer 1

Answer:

Object at infinity:

Convex lens converge parallel rays coming from objet at infinity and a highly diminished - point sized, real and inverted image is formed at principal focus F2. Properties of Image: Image is highly diminished, real and inverted.

Explanation:

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Answer 2

if object at infinity in concave mirror then the image forming at f and the image real , inverted , diminished in size.

if object at infinity in convex mirror the the image forming behind the mirror at f and the image is erect diminished in size.