Refraction of light from air to glas and from air to water are shown in figure (i) and figure (ii) below. The value of the angle `theta` in the case of refraction as shown in figure (iii) will be

Options

A. `30^(@)`
B. `35^(@)`
C. `60^(@)`
D. `41^(@)`

Answer

B

Explanation

`.^("air")mu_("glass")=(sin60^(@))/(sin35^(@))` ...(i)
`.^("air")mu_("water")=(sin60^(@))/(sin41^(@))` ...(ii)
`.^("water")mu_("glass")=(sin41^(@))/(sintheta)` ...(iii)
`.^("air")mu_("water")xx.^("water")mu_("glass")=.^("air")mu_("glass")`
`(sin60^(@))/(sin41^(@))xx(sin41^(@))/(sintheta)=(sin60^(@))/(sin35^(@))` ("Using" (i),(ii)and(iii))
`sintheta=sin35^(@)impliestheta=35^(@)`