Answer:
Option c) A massive collapsed star
Explanation:
A black hole forms as a result of the collapse of the center of a massive star into itself. This process is known as supernova.
The gravitational pull of the black hole is enormously strong enough that nothing can escape it not even any electromagnetic radiations or light and absorbs everything that tries to cross it as a result of enormously massive star into a very tiny or small space.
The angle of refraction is 15.6 deg.
When a ray of light passes from medium 1 to medium 2, the refractive index of medium 2 with respect to 1 is the ratio of the absolute refractive index of medium 2 and medium 1

When light passes from air into diamond, with the given values of refractive indices,

According to Snell's law,

The angle of refraction is 15.6 deg
Answer:
µ = 
Explanation:
µ = 1/ sinC
µ -----> refractive index of medium
C ----> critical angle
Hope this helps!