Question

5. The refractive index values of different material are given under :
The unit of refractive index is
A) Centimeter B) Diapter
D) No units
C) Degree
D) Ruby
Material
Refractive index
Crown glass 1.52
Ruby
1.71
Ice
1.31
Sapphire
1.77
Imagine, in which of the above, the velocity of light is greater ? AP Mar
A) Sapphire
B) Crown glass C) Ice
AP June 20
6. Twinkling of stars is due to .....
A) Total internal reflection.
B) Scattering
C) Dispersion
D) Atmospheric refraction of light.
7. Assertion 'A': A lemon in a glass of water appears bigger than its actual
Reason 'R
: Total internal reflection takes place when angle of inciden
than critical angle.
Which of the following is correct?
AP (June 2
A) A is true but R is false.
B) Both A, R are true and R is the correct explanation to A.
C) Both A, R are true and is not the corrent​

Answer 1

refractive index has no units

velocity of light is greater in ice.since refractive index is inversly proportional to velocity of light in medium

twinkling of stars is due to atmospheric refraction

7. option c