Question

What is the focal
of double
concave lens kept in

air with two spherical of radii R1 =30cm and R2=60cm
take refractive indenx of lens as n = 1.5​

Answer 1

Answer:

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Answer 2

Answer:

Using lens makers formula

f1=(μ−1)[R11−R21]        where R1=−ve

f1=(1.5−1)[(−30)1−601]

f1=(0.5)[603]=−0.5×201

f=−40cm

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