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Question
Where should an object be placed in front of a convex lens so as to form an inverted and enlarged image? Will the image be real or virtual? Draw a ray diagram to illustrate your answer.
Solution
To form an inverted and enlarged image by a convex lens, the object should be placed between F and 2F in front of the lens.
The image will be real.
The ray diagram is shown in the figure. For the object AB, the images are A’B’.
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RELATED QUESTIONS
A student focuses the image of a well-illuminated distant object on a screen using a convex lens. After that, he gradually moves the object towards the lens and each time focuses its image on the screen by adjusting the lens.
(i) In which direction, towards the screen or away from the screen, does he move the lens?
(ii) What happens to the size of the image? Does it decrease or increase?
(iii) What happens to the image on the screen when he moves the object very close to the lens?
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If the object is moved to a point only 3 cm away from the lens, what is the new position, height and nature of the image?
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b) Write in brief the working of this optical instrument.
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d) Draw the figure again and labelled it properly
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Object at 2F1 of a convex lens : Image at 2F2 : : Object at F1 : _______
Find the odd one out and give its explanation.
