Rahul placed a candle flame in front of a convex lens at various distances from it and obtained the image f the candle flame on a white screen. He noted down the position of the candle, screen and the lens as under Position of candlc = 20cm ; Position of convex lens- 50 cm Position of the screen= 80 cm Convex lens В' What is the position of the image formed from the convex lens? (a) 80 cm (b) 50 cm (c) 30 cm (d) 60 cm What is the focal length of the convex lens? (a) 15 cm (b) 30 cm (c)-15cm (d)-30 cm Where will the image be formed if he shifts the candle towards the lens at iv a position of 35 cm? (a) At focus (b) Between focus & pole (c) At infinity (d) Between 12 & 1 Which of the following statement describes the best about the nature of the image formed if Alwin shifts the candle towards the lens to 40cm? (a) The nature of the image formed will be virtual, inverted and magnified. (b) The nature of the image formed will be virtual, erect and magnified. (c) The nature of the image formed will be virtual, erect and diminished. (d) The nature of the image formed will be real, inverted and diminished.
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Answer:Distance of object from lensu=50−26=24cm
Distance of the screen from the lensv=74−50=24
From lens formula,
v
1
−
u
1
=
f
1
24
1
−
−24
1
=
f
1
2
24
=−f
f=−12cm
(B). Now when the object is shifted to distance of 38 cm u=50−38=12cm
Since u=f, the image will form at infinity.
Explanation:
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