Refractive Index

Question 1

What is the formula for refractive index?

Answer 1

n = c/v
Refractive index = speed of light (3x10 8 m/s) / speed of light in medium

OR

n = sin i / sin r
Refractive index = sin angle of incidence / sin angle of reflection

Question 2

What is the formula for critical angle?

Answer 2

n = 1 / sin c
Refractive index = 1 / sin critical angle

Question 3

At what angle must the angle of light be to totally internally reflect?

Answer 3

Bigger than the critical angle

Question 4

What are the 2 types of lenses?

Answer 4

Converging and Diverging Lenses

Question 5

What are the 4 factors that describe where the image has formed in a lens diagram?

Answer 5

Upright/Inverted
Magnified/Diminished
Real/Virtual
Position