Please ans.qno.10. option(1)
Q.10. A prism of material refractive index $\mu$ has refracting angle A. For which of the following incidence angle there will be normal emergence of ray
(1) ${\sin }^{-1}\left(\mu \sin A\right)$
(2) ${\cos }^{-1}\left(\mu \cos A\right)$
(3) ${\sin }^{-1}\left(\mu \cos A\right)$
(4) ${\cos }^{-1}\left(\mu \sin A\right)$