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CBSE Class 10 Answered

Why is object placed between 2f1 and f1 in a convex lens projector ?
Asked by pras.rangi | 26 Jul, 2021, 09:06: AM
answered-by-expert Expert Answer
In convex lens projector, we have to obtain enlarged,real and inverted image. 
The image obtained by it must be formed at large distance on the screen. 
When the object is placed between 2F1 and F1 in front of convex lens, the image formed is enlarged, real and inverted and is formed beyond 2F1. 
Thus, to obtain the desired image through convex lens projector the object is placed between 2F1 and F1. 
 
 
Answered by Shiwani Sawant | 26 Jul, 2021, 11:05: AM

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CBSE 10 - Physics
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A 4.0 cm tall object is placed perpendicular ( e.at 90) to the principal axis of a convex lens of food length 10 cm . The distance of the object from the lens is 15cm. Find the math, position and size of the image.Also find its magnification.
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Why is object placed between 2f1 and f1 in a convex lens projector ?
Asked by pras.rangi | 26 Jul, 2021, 09:06: AM
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 35. A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its image on the screen. (A) In which direction does he move the lens to focus the flame on the screen? (B) What happens to the size of the image of the flame formed on the screen? (C) What difference is seen in the intensity (brightness) of the image of the flame on the screen? (D) What is seen on the screen when the flame is very close (at about 5 cm) to the lens?
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