Question

the image of a candle flame place at a distance of 36 cm from a spherical lens is formed honour screen placed at a distance of a 72 cm from the lens. identify the type of lens and calculate its focal length if the height of flame is. 2. 5 cm find the height of the image

Answer 1

here it is convex lens
we have given
u=36
v=72
f=?

by using sign convention
u=-36
v=72

by using lens formula
1/v-1/u=1/f
1/72-1/-36=1/f
1/72+1/36=1/f
3/72=1/f
f=24 answer

we know
h2/h1=v/u
h2/2.5=72/-36
h2=-2×2.5
h2=-5 answer

hence the height of image is- 5cm

focal length is 24cm

hope it will help you

Answer 2

Answer:

i hope this would help uh guyzzz☺️❣️