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Bharat Raj Salvi
Asked: 2022-11-09T05:25:32+05:30 In:

Focal length of a convex lense in air is `10cm`. Find its focal
length in water. Given that `mu_g=3//2` and `mu_w=4//3`.
A. 2.5 cm
B. 5 cm
C. 20 cm
D. 40 cm

Focal length of a convex lense in air is `10cm`. Find its focal
length in water. Given that `mu_g=3//2` and `mu_w=4//3`.
A. 2.5 cm
B. 5 cm
C. 20 cm
D. 40 cm
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1 Answer

  1. Correct Answer – D
    `(1)/(f_1)=(._amu_g-1)((1)/(R_1)-(1)/(R_2))` …(i)
    `(1)/(f_(omega))=(._(omega)mu_g-1)((1)/(R_1)-(1)/(R_2))` ….(ii)
    `f_(omega)/(f_(a))=((._amu_(g)-1))/((._omegamu_(g)-1))=((._amu_(g)-1))/(((._amu_(g))/(._amu_omega)-1))`
    `(f_(omega))/(10)=(((3)/(2)-1))/(((3//2)/(4//3)-1))=4impliesf_(omega)=40cm`

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