Question

are biconcave lenses radius curvature equal
are equiconcave lenses radius of curvature equal
are planoconcave lenses radius of curvature equal
are convexoconcave lenses radius of curvature equal

Answer 1

Explanation:

ANSWER

Applying lens maker formula for lens 1,

f

1

1

=(μ−1)(

R

1

1

−

R

2

1

)

f

1

1

=(1.5−1)(

14

1

−0)

f

1

1

=

14

0.5

For lens 2,

f

2

1

=(μ−1)(

R

1

1

−

R

2

1

)

f

2

1

=(1.2−1)(0−(

−14

1

))

f

2

1

=

14

0.2

Now,

f

1

=

f

1

1

+

f

2

1

so

f

1

=

14

0.7

Therefore, From lens formula :

v

1

=

140

7

−

40

1

v=40cm

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Answer 2

μ2 = 1.5 fair = 10 cm f of a plano convex lens = 2 fair = 20 cm fairfliq = 1.125 - 11.5 - 1 feq = 80 cm feq = f1f2f1+f_2 = 80 × 80160 = 40 cm

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