Question

A student focuses the image of a candle flame on a white screen by placing the flame at various distance from the convex lens. He noted the observations as follows:

(Answer any four questions from 1 to 5)

Distance of flame from the lens:
1.60cm
2.40cm
3.30cm
4.24cm
5.12cm
Distance of screen from the lens:
1.20cm
2.24cm
3.30cm
4.40cm
5.70cm
1) In which case is the size of image equal to the size of object

A) 1

B) 2

C) 4

D) 3

2) In which case observation is wrong?

A) 4

B) 5

C) 2

D) 3

3) The magnification of the image in case 2 is:

A) -0.6

B) +0.6

C) -1/6 D) +1/6

4) The power of the lens is:

A) -20/3 D

B) +1/15D

C) +20/3D

D) -1/15D

5) The real inverted and enlarged image is formed in case of:

A) 1

B) 4

C) 3

D) 2

Answer 1

Answer:

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Answer 2

Answer:

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 its image on the screen. ... (a) When the flame is moved gradually towards the lens, the lens has to be moved towards the flame.