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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा १०

Where should an object be placed so that a real and inverted image of the same size is obtained by a convex lens?

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प्रश्न

Where should an object be placed so that a real and inverted image of the same size is obtained by a convex lens?

विकल्प

  • f

  • 2f

  • infinity

  • between f and 2f

MCQ
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उत्तर

2f

Explanation:

Convex Lens Properties: A convex lens can produce both real and virtual images depending on the position of the object relative to the focal length F and twice the focal length 2F.

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अध्याय 2: Optics - Evaluation [पृष्ठ २९]

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सामाचीर कलवी Science [English] Class 10 SSLC TN Board
अध्याय 2 Optics
Evaluation | Q I. 2. | पृष्ठ २९

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An object is placed at a distance 2f from a convex lens of focal length f. The size of the image formed is ______ that of the object.


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Which of the following lens would you prefer to use while reading small letters found in a dictionary?


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  1. between optical centre and focus of the lens
  2. between focus and twice the focal length of the lens
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  4. at infinity
  5. at the focus of the lens

A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under

Position of candle = 12.0 cm

Position of convex lens = 50.0 cm

Position of the screen = 88.0 cm

  1.  What is the focal length of the convex lens?
  2. Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm?
  3. What will be the nature of the image formed if he further shifts the candle towards the lens?
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