(i) When a ray of light travel from denser to rarer medium, the refracted ray bonds away from the natural
Correct option is (A)
(ii) Critical angle \(\theta = sin^{-1}\left(\frac{n_{air}}{n_{water}}\right)\)
\(\theta = sin^{-1}\left(\frac1{1.33}\right)\)
\(\theta = 48.75^\circ\)
Correct option is (c) water
(iii) Critical angle \(\theta = sin^{-1}\left(\frac{n_2}{n_1}\right)\)
\(\theta = sin^{-1}\left(\frac1{2}\right)\)
\(\theta = sin^{-1}\left(sin30^\circ\right)\)
\(\theta = 30^\circ\)
Correct option is (b) 30°
(iv) \(\theta = sin^{-1}\left(\frac1x\right)\)
\(sin\,\theta = \frac1{x}\)
\(x= \frac1{sin\,30^\circ}\)
x = 2
\(x = \frac c{v_m}\)
\(v = \frac{c}{x}\)
\(v = \frac{3\times10^8}{2}\)
v = 1.5 x 108 m/s
Correct option is (b) 1.5 x 108 m/s