Question

from the lens formula:1/f=1/v-1/u.v = 3x and u = 10 cm.find f​

Answer 1

Explanation:

we know 1/f =1v -1/u

so,

u --10

v= 3x

by putting values we get,

1/f =1/3x+ 1/10

f = 30x/13x

f=2.30 (approx.) cm

Answer 2

sry bro trying I will do tommorow follow me and ask me tomorrow.i will do it surely

Explanation:

given. v=3x,u=10

1/v-1/u=1/f

or,1/3x-1/10=1/f

or,1/f=10-3x/30x (taking lcm)

or,30x=f(10-3x)

or,30x/10-3x=f

or,