Question

are the image of candle flame placed at a distance of 30 cm from a spherical lenses formed on a screen placed at a distance of 60 cm from the lens at 9:20 type of lens and calculate its focal length if the height of the flame's 2.4 cm find the height of the image please please please answer me fast filter​

Answer 1

Since the image is formed on the screen.

therefore it is a convex lens.

f=?

v=+60

u= -30

1/f = 1/60 - 1/-30

1/f = (1+2)/60

= 3/60

f = 60/3 = 20

v/u = h(i)/ h(o)

60/-30 = hi/ 2.4

hi = 2.4 X -2

= 4.8

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