Physics lenses/critical angle question need asap

The answer should be B.

There are 2 conditions for total internal reflection:

For this question, light is travelling from glass to air, so the first condition is fulfilled. Yet, the angle of incidence is only 30°, which is less than the critical angle. Therefore, total internal reflection will not occur.

Instead, there will be refraction. Light ray bends away from normal when it is travelling to a less dense object, thus having a greater angle of refraction than the angle of incidence.

heats surface water up

prndulum needs thread, weight clock to time swings