Question

An object is placed below two parallel layers of thickness \(d_1,d_2\) are refractive index \(\mu _1,\mu_2\) respectively. Find apparent depth of the object.

(1) \(\frac{d_1\mu_2 - d_2\mu_1}{\mu_1\mu_2}\)

(2) \(\frac{d_1u_2 + d_2\mu_1}{\mu_1\mu_2}\)

(3) \(\frac{d_1\mu_1 + d_2\mu_2}{\mu_1\mu_2}\)

(4) \(\frac{d_1\mu_1 - d_2\mu_2}{\mu_1\mu_2}\)

Answer 1

Correct option is : (2) \(\frac{d_1u_2 + d_2\mu_1}{\mu_1\mu_2}\) 

\(\mu = \frac{d_1}{\mu_1} + \frac{d_2}{\mu_2}\)