66.From ray diagram show the (1) image formation by concave lens for the object at focus. (2) image formation by concave lens for the virtual object at focus

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Question 33
Draw ray diagrams showing the image formation by a concave lens when an object is placed

(a) at the focus of the lens
(b) between focus and twice the focal length of the lens
(c) beyond twice the focal length of the lens

Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image.

Draw well labelled ray diagrams for image formation by convex lens when

(1) Object is at 2F₁

(2) Object between F₁ and 2F₁

(3) Object between focus F₁ and optical centre O.

Q. If the object is placed at a principal focus

F_{1}

of a convex lens, draw the ray diagram for the image formation.

Q. Statement1: Myopia is corrected by the use of the concave lens.
Statement 2: A concave lens forms a virtual image of the object kept at infinity at its focus. Therefore the image formed by concave lies within the far point of the myopic eye, which then acts as the object for the myopic eye thus helping it view it.

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