image distance is 60cm and object distance is 30cm then find focal length of convex lens
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heya!!
here,u=-30
v=+60
so by lens formula,
1/f=1/v - 1/u
1/f= 1/60 - 1/-30
1/f= 1/60 + 1/39
1/f= (1+2)/60 {taking lcm}
1/f= 3/60
1/f= 1/20
therefore, focal length, f=20 cm
hope it helps u ☺️
here,u=-30
v=+60
so by lens formula,
1/f=1/v - 1/u
1/f= 1/60 - 1/-30
1/f= 1/60 + 1/39
1/f= (1+2)/60 {taking lcm}
1/f= 3/60
1/f= 1/20
therefore, focal length, f=20 cm
hope it helps u ☺️
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