This type of lens is called a converging lens because parallel the lens converge

Question

This type of lens is called a converging lens because parallel the lens converge at a point to form a real image on the other sid rays of light sent Acti Your eye lens and a magnifying lens are examples of converging lenses parallel rays, both can form real images. Even withou Get For example, a light bulb sends its light rays radially outward (not can see an image of this light bulb parallel) and yet you To comea light bulb retina The lens (and cormea) of your eye causes the diverging light rays that enter your eveto converge and form a real image at your retina. Your eye (and other lenses) can also make sense out of reflected light. When you look at a book, e.g., it is not self-luminous like a light bulb, but is considered a source of light rays even if it is seen by diffuse reflection. In either case, it's reasonable to ask what type of image does a lens form and where is that image. That will be the main focus of today's io ?n experiment. Consider point 'A on your Activity I sheet. Suppose that point "A" is a tiny object emiting or reflecting light in all directions. To locate the image point of "A" on paper draw ray I, ray 2, and ray 3 as described in the "Optional Class Activity". Using differet colors for each ray is helpful. Use solid lines (drawn using a ruler) for real rays and dashed lines for virtual rays (if there are any). Make sure to indicate directions. Ihe point where the rays cross is called an image point. fre Confirm your ray tracing experimentally. Rotate the slot board so that only"one lng ray" emerges. Shine this ray through point "A along each of the rays you've draw check that is refracted by the lens in doesn't agree perfectly, but it should be close. It's also interesting to shine the way you've predicted. You may find reality point "A and through the lens along a direction that is not one of the three its path. th rays, noting 02 Is the image real or virtual? Is the image upright or inverted? Is the image magnified or reduced? lf you wish, you can use the thin lens equations as described in the Activity" to confirm your results in yet another way! CNM PHYSICS& ASTRONOMY

Explanation / Answer

(i) The image is formed real in the eye because the rays pass through the converging lens present in the cornea and it is formed at the back of the eye which is sent back to brain to process the image via optic nerve .

(ii) The image formed is inverted one as the rays meet below the plane to form an image . It is then processed by the brain so that it appears to be an upright image.

(iii) The magnification of the image depends upon the distance of the object , for example if the object is beyond the focus of the eye lens then the magnification will get increase as soon as the object moves in the direction of the focal point.

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