When a slide is placed 15 cm behind the ...

When a slide is placed 15 cm behind the lens in a projector, an image is formed at 3 infront of the lens. (i) Show the image formation by a ray diagram. (ii) Find the focal length of the lens. (iii) What will be the distance between the lens and the slide in order to get and image at a distance 4 metre from the lens ? (iv) Determine the magnification for the case (iii).

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The correct Answer is:

(ii) `+14.3cm` (ii) `-14.8cm` (iv) `-27`

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