Question

answer to this questions friends the best answer will be marked as the most brainliest see the attachment given and answer to this

Answer 1

Position of candle = 26cm

Position of convex lens = 50cm

Position of screen = 74cm

In attachment , I saw position of all the given things

form here, it is clear that,

(i) object (candle ) distance from lens , u = 50cm - 26cm = 24cm

image (on screen) distance from lens ,v = 74cm - 50cm = 24cm

Here , v = u

it means object place at centre of curvature of lens

so, u = 2f , f is focal length

f = u/2 = 24/2 = 12cm

(ii) position of candle = 38cm

so, object (candle ) distance from convex lens = position of convex lens - position of candle = 50cm - 38cm = 12cm

∴ u = -12cm and focal length f = 12cm

Now, use formula,

1/f = 1/v - 1/u

1/12 = 1/v -1/-12

⇒ v = ∞ , hence image is formed at infinity .

Answer 2

1. 12cm

2. at infinity

3. u should draw it keeping on focus and the image at infinity