CBSE Class 10 Science 2018 · Paper 31(B) · Question 26(b)

With the flame at $60$ cm (beyond $2F$): the image on the screen is (i) real and inverted, and (ii) diminished, about one-fourth the size of the flame; it is sharp and bright. [$v=+15$ cm, $m=-\frac{1}{4}$] With the flame moved to $15$ cm (between $F$ and $2F$): (i) the image is still real and inverted (no change), but (ii) it becomes enlarged, about four times the size of the flame, and comparatively less bright. The screen has to be moved to about $60$ cm from the lens to receive it. [$v=+60$ cm, $m=-4$]