a barometric height at sea level is 76 cm of mercury while that at a point on a highland is 74 centimetres of mercury determine the altitude of the point (Take g as (10N/kg) the density of mercury is 13600 kilograms per metre cubic and density of air is 1250 kg per metre cubic ​

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.