Light, Mirrors and Lenses

Question 1

What is the speed of light?

Answer 1

c = 3*10^8

Question 2

What is the wavelength of visible light?

Answer 2

700 nm - 400 nm

Red - violet

Question 3

What is the angle of incidence equal to?

Answer 3

The angle of reflection

Question 4

What is the equation of the index of refraction?

Answer 4

n = c / speed of medium

The more the refraction, the bigger “n” is

Question 5

What is the index of refraction of light in a vacuum / air?

Answer 5

n = 1

Question 6

What is snells law?

Answer 6

n1sin(theta)1 = n2sin(theta)2

Question 7

When is index of refraction “n” gets bigger what happens to sin theta in snells law?

Answer 7

It gets smaller because the larger the “n”, the more refraction occurs

Question 8

If we look at a fish in water with n = 1.33, is the fish father away than it seems or closer than it seems?

Answer 8

It is closer than it seems?

Question 9

What is the equation for critical angle?

Answer 9

sin theta of critical = n2 / n1

Question 10

What is the critical angle?

Answer 10

It is when the refractory angle is 90 degrees to the normal

Question 11

What happens to light being transmitted above the critical angle?

Answer 11

It is reflected

Question 12

Does sound speed up when going from air to liquid?

Answer 12

Yes

Question 13

Diffraction vs dispersion?

Answer 13

Diffraction is the spreading out waves as if emerging from a new point after coming across an obstacle

Dispersion is the splitting up of white light in a prism

Question 14

What do higher frequency of light express in terms of indexes of refraction?

Answer 14

They experience higher indexes of refraction

Question 15

What is polarization in light?

Answer 15

When one direction of oscillation if privileged over another

Question 16

What is plane polarized light?

Answer 16

Light goes up and down when seen from the front.

Remember biophysical chemistry

Question 17

What is circular polarized light?

Answer 17

Two perpendicular electric field components oscillate 90 degrees out of phase with each other

Question 18

What is the focal length equation?

Answer 18

(1 / focal length) = (1 / object distance) + (1 / distance of image formed)

Question 19

What is the magnification equation of lens?

Answer 19

magnification = ( - distance of image formed) / (distance of object)

Question 20

What is the focal length of a converging optics (concave mirror and convex lens)?

Answer 20

Focal length is always positive

Question 21

What is the focal length of a diverging optics (convex mirror and concave lens)?

Answer 21

Focal length is always negative

Question 22

Is the image distance where light actually goes positive or negative?

Answer 22

It is positive

For lens it’s past them while for mirrors it’s before them since they reflect light

Question 23

What is a real image?

Answer 23

Image shown where light converges (they are flipped)

Real images have “i” that is positive

Question 24

What is a virtual image?

Answer 24

Image shown where light does not converge (not flipped)

Virtual images have “i” that is negative

Question 25

What is the equation of lens power (units in diopters)?

Answer 25

P = 1 / f

Question 26

What is the unit diopter?

Answer 26

It is equal to meters

so 7 diopter is equal to 7 m which is equal to 700 cm

Question 27

What are the types of lens of near nearsightedness and far farsightedness?

Answer 27

Converging for far and diverging for near

Question 28

What is myopia?

Answer 28

Eye focuses light too much and can’t reach retina (near sight)

Question 29

What is hyperopia?

Answer 29

Eye does not bring light into focus at the retina (far sight)