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7 Fig. 7.1 shows an object and its image formed by a converging lens. One ray from the tip of the object to the tip of the image is shown. Fig. 7.1 is drawn full size. lens object image Fig. 7.1 (a) Place a tick (✓) in all boxes that correctly describe the image. diminished enlarged inverted upright real virtual (b) On Fig. 7.1, draw a ray, passing through a principal focus of the lens, from the tip of the object to the tip of the image. Label the principal focus F. (1) (c) Use the ray you have drawn in (b) to determine the focal length of the lens, focal length = ... (d) Draw another ray, not passing through a principal focus of the lens, that passes from the tip of the object to the tip of the image. [1] [Total: 5)

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Similar Questions
Q1
The given figure shows an object AB, placed on the principal axis of a convex lens. F1 and F2 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 F2, 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]
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Q2
(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?
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Q3
Define principal focus of a convex lens. Draw light ray diagram of an image formed, when the object is placed in between principal focus F and 2F.
Write lens formula.
Calculate power of a lens if its focal length is 0.5m.
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Q4

The lenses form different types of images when an object is placed at different locations. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.

When a ray goes through the optical centre of the lens, it passes without any deviation. If the object is placed between the focus and optical center of the convex lens, an erect and magnified image is formed. As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also the size of the image goes on increasing and the image is always real and inverted.

A concave lens always gives a virtual, erect and diminished image irrespective of the position of the object.

Based on the paragraph, answer the following question:

When the object is placed at 2F in front of a convex lens, what is the location of the image?


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Q5

The lenses forms different types of images when object placed at different locations. When a ray is incident parallel to the principal axis, then after refraction, it passes through the focus or appears to come from the focus.
When a ray goes through the optical centre of the lens, it passes without any deviation. If the object is placed between focus and optical center of the convex lens, erect and magnified image is formed.As the object is brought closer to the convex lens from infinity to focus, the image moves away from the convex lens from focus to infinity. Also the size of image goes on increasing and the image is always real and inverted.
A concave lens always gives a virtual, erect and diminished image irrespective to the position of the object.


Based on the paragraph, answer the following question:

(i) When the object is placed at the focus of concave lens, what will be the characteristics of the image formed?

(ii) When the object is placed at 2F in front of convex lens, what is the location of the image?


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