Question

A student places a candle flame at a distance of about 60 cm from a convex lens of focal length 10cm and focuses the image of the flame on screen

Answer 1

we are given
u=-60cm
f=10cm
v=?
by using lens formula
1/v-1/u=1/f
1/v=1/10-1/60
1/v=5/60
v=12cm answer

Answer 2

Answer:

Image distance, v = 12 cm

Explanation:

It is given that,

Distance of candle flame from the lens, u = -60 cm

Focal length of the lens, f = +10 cm

Using lens formula :

$\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

$\dfrac{1}{v}=\dfrac{1}{f}+\dfrac{1}{u}$

$\dfrac{1}{v}=\dfrac{1}{10}+\dfrac{1}{-60}$

Image distance, v = 12 cm

Hence, this is the required solution.