3. Light rays travel from air to medium Q as shown. Refractive index of air = 1. air
45
30
Calculate the refractive index of Q.

Iwould have to say sorry i can't elaborate more. hope this though!

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.