Question

the image of a candle flame placed at a distance of 30 cm from a spherical lens is formed on the screen placed on the other side of the lens at a distance of 60 m from the optical centre of the lens identify the type of lens and and calculate its focal length if the height of the flame is 3 cm find the height of the image

Answer 1

Answer:

it is convex lens.3

Explanation:

60m=60*100=6000cm

v=6000cm

u=-30cm

$1 \div f = 1 \div v - 1 \div u$

substituting the values..

1/f=201/6000

f=6000/201

v/u=hi/ho

6000/-30=hi/3

hi=600cmor 6m