Question

A Point object is kept lo cm away
from a double Convex lense of refractive
index 1.5 and radio of curvature 10 cm
and 8 cm. find the focal length of the
lense​

Answer 1

Answer:

Use Len's Maker Formula,

1/f = ( n - 1)( 1/R1 + 1/R2 )

1/f = ( 1.5 - 1)( 1/ 8 + 1/10)

1/f = 0.5 × ( 5 + 4) / 40

1/f = 0.5 × 9 /40

f = 80/9

f = 8.8 cm