Question

The radii of curvatures of both the surfaces of a double convex lens are equal (R=30cm).
Calculate its focal length.
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Answer 1

ram ram ...

The formula is given by

1/f = (n-1){(1/R1)-(1/R2)}

Here

R1= 15cm

R2= 30cm

Refractive index n=1.5

We've to find focal length

Thus, using the lens maker formula

1/f= (1.5-1) ((1/15)-(1/30))

= (0.5) (0.066-0.033)

= 0.5*0.033

=0.165

Hence f= 1/0.165

f= 6.06cm

The focal length is 6.06cm

Answer 2

Answer:

The focal length is 6.06

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