Can you please help me? With my calculations, I received the answer 0.8888, but I am not sure if this is right. Can you please double check?

A light beam is traveling through an unknown substance. When it strikes a boundary between that substance and the air (hair ~ 1) , the angle of reflection is 34.0 and the angle of refraction is 39.0. What is the index of refraction n of the substance? n = 0.8888 TOOLS x10You have a lens whose focal length is 12.7 cm. You place an object on the axis of the lens at a distance of 6.43 cm from it. How far is the object's image from the lens? Enter the answer as a positive quantity. If it can be determined, is the image real or virtual? 0 real 0 cannot be determined 0 virtual If it can be determined, is the image upright or inverted with respect to the object? O inverted 0 cannot be determined 0 upright