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Common Rays in Thin Lenses

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show analytically from the lens equation that when the object is at the principal focus ,the image is formed at infinity

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Q. A concave lens makes a/an image formed at the principal focus (

F_{1}

) when an object is at infinity.

Q. Assertion :Position of image approaches focus of a lens, only when object approaches infinity. Reason: Paraxial rays incident parallel to principal axis intersect at the focus after refraction from lens.

Where should an object be placed in front of a convex lens to get a real image of the size of the object?

(a) At the principal focus of the lens

(b) At twice the focal length

(c) At infinity

(d) Between the optical centre of the lens and its principal focus.

Q. Question 3
Where should an object be placed in front of a convex lens to get a real image of the size of the object?

(a) At the principal focus of the lens
(b) At twice the focal length
(c) At infinity
(d) Between the optical centre of the lens and its principal focus

Why image is formed at focus when object is placed at infinity?

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Common Rays in Thin Lenses

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