Question

Aman and his friend Rahul placed a candle flame in front of a convex lens at various
distances from it and obtained the image of the candle on a white screen.
He noted down the position of the candle, screen and the lens as under:
Position of candle = 10 cm
Position of convex lens = 50 cm
Position of screen = 90 cm

Answer 1

Answer:

1. d
2. b
3. b
4. c

Hope it helps you thanks ❤️❤️

Answer 2

The local length of the convex kits in 20.

Explanation:

$u=50-10$

$u=40$

$v=90-50$

$v=40$

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

$=\frac{1}{40}+\frac{1}{40}$

$2f=40$

$f=20$.