Question

JEE mains Previous year question chapter :- Geometrical Optics​

Answer 1

Answer:

Mark me in the brain list

Explanation:

We know

θcric=sin−1(n1)

45o>θ

sin(45o)>n1

  ⇒n>2

Answer 2

Answer:

Oprtion (D) is correct n > √2

Explanation:

total internal reflection from glass-air interface, critical angle C must be less than angle of incidence

i.e ,C < i

figure of Situation is given in the atttachment .

C < 45°

But , n = 1/sin45°

• C = sin⁻¹(1/n)

• = sin⁻¹(1/n) < 45°

• = 1/n < Sin45

• n > 1/ (1/√2)

• n > √2 Answer