Question

Remove the rays from the simulation by clicking on them and then pressing Delete. Place a Point Source at (60,180) by clicking Point Source under Tools, then clicking the simulation at (60,180). Note that the location at which the rays converge is the same as it was using the principal ray method. This is, in fact, why we use the principal ray method: it generates the convergence point using comparatively few lines. As we know from Huygens's principal, every point that emits light emits it in all directions, just like the Point Source here. To simulate a real object, we could put an infinite number of Point Sources infinitely close together in the shape of the object and then see the resulting image. That is hardly practical. We will only use three. Place the next two Point Sources at (60,160) and (60,140) and notice how the rays to the right of the lens change. At this point, there will be enough rays that the rulers can be difficult to read; it is useful to know that the grind points to which your Point Sources are snapping are always 20 mm apart. OOOO Looking at how the rays to the right of the lens change as you add additional Point Sources, what have you confirmed? This configuration produces no real image. This configuration produces positive magnification. This configuration produces an inverted image. This configuration produces a positive image.

Answer 1

1) It is given that the lens converges light. So, the lens is converging lens. The image produced by a convex lens when the object is placed after the focus.

So, the image produced is positive.

2) The rays parallel to the principal axis converges to the focus of the lens. But when we change the angle of the rays, the rays ray not converge to the focus. For example, the ray of light passing through the centre of the lens need not pass through the focus of the lens.

3) A concave lens produce a virtual image on the left of the lens. An observer can see the image when viewed through the lens. But the image cannot be projected on a screen