Well sustainability means the ability of future generations to meet their own needs so technology gets in the way of things getting done and is distracting in some ways. i hope this helps!
Answer:
η₁ = 2.6
Explanation:
Here, we will use snell's law to calculate the refractive of the substance:

where,
η₁ = refractive index of first substance = ?
η₂ = refractive index of second substance = 1.5
θ₁ = angle of incidence = 30°
θ₂ = angle of refraction = 60°
Therefore,

<u>η₁ = 2.6</u>
You might want to go to this website, http://www.indiana.edu/~p1013447/dictionary/mendel.htm
Welcome, And i hope this helps :P
If you were to sit a hot cup of water out side it would frezze faster