card 5

Question 1

Definition and formula of the critical angle

Answer 1

The critical angle occurs when the angle of incidence where the angle of refraction is
90 degree.

θc=sin-1(n2/ n1)

Question 2

Definition and formula ofoptical density substances

Answer 2

D=log(i/T)=log(i0/i)

Question 3

lens maker formula

Answer 3

1/f=(nl-nm)(1/R1 + 1/R2)

Question 4

Why can light be selectively absorbed when it pass through any colored liquid?

Answer 4

Selected absorbed frequency at the light wave matches the frequency at which electron in the atoms of material vibrate

Question 5

Give definition of dispersion of light. Which dispersion is called normal dispersion?

Answer 5

Dispersion is light separate into its component colours.
Which the separation of components in one spectrum increases continuously and almost uniformly with the wavelength

Question 6

Definition of refraction of light.

Answer 6

Bending of light as it passes through transparent substances into another

Question 7

Give definition of polarized light. Which ways of light polarization do you know?

Answer 7

A light wave which vibration occurs in a single plane.
1) absorption (dichroic material)
2) double refraction (birefringent crystal)
3) reflection (specular reflection)