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Question
(a) Explain why, a real image can be projected on a screen but a virtual image cannot.
(b) Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.
(c) Name one simple optical instrument in which the above arrangement of convex lens is used.
(b) Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.
(c) Name one simple optical instrument in which the above arrangement of convex lens is used.
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Solution
(a) A real image can be projected on a screen unlike a virtual image because a real image is formed by the actual meeting of light rays. A virtual image, on the other hand, is not formed by the actual meeting of light rays.
(b) When an object placed is beyond 2F', the image formed by the convex lens is real and diminished, as shown in the figure.
(c) A camera works on the above arrangement because the camera lens produces a small, real and inverted image of an object on the film.
(b) When an object placed is beyond 2F', the image formed by the convex lens is real and diminished, as shown in the figure.
(c) A camera works on the above arrangement because the camera lens produces a small, real and inverted image of an object on the film.
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