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Image Formation by Convex Lens

Consider the ...

Question

Consider the ray shown in the diagram as paraxial. The image of the virtual point object $O$ formed by the lens $L L$ is

A

Virtual

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B

Real

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C

Located below the principal axis

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D

Located to the left of the lens

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Solution

The correct options are
A Virtual
C Located below the principal axis
D Located to the left of the lens
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I

is formed of a point object

O

by a lens whose principal axis is

A B

as shown in figure. The lens used is :

Q. The given figure shows an object AB, placed on the principal axis of a convex lens.

F_{1}

F_{2}

are the foci of lens Copy the diagram.

(a) Draw a ray of light from point B and passing through O. Show the same ray after refraction through the lens.
(b) Draw another ray from B, which passes through

F_{2}

, after refraction by the lens.
(c) Locate the final image formed.
(d) Is the image real or virtual?
(e) The image formed is inverted or erect?
[5 MARKS]

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.

Q. (a) An object is placed well outside the principal focus of a convex lens. Draw a ray diagram to show how the image is formed, and say whether the image is real or virtual.
(b) What is the effect on the size and position of the image of moving the object (i) towards the lens, and (ii) away from the lens?

Q. An object AB is placed between O and

F_{1}

on the principal axis of a converging lens as shown in the diagram.
Copy the diagram and by using three standard rays starting from point A, obtain an image of the object AB.

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