Gr 10 optics

Question 1

Incandesence

Answer 1

glows at high temp, Coal, FIre

Question 2

Electric discharge

Answer 2

Electricity moving not through a metal

Lighting

Question 3

Phosphoresence

Answer 3

Takes in light and releases it much slower
Glow in teh dark toys

Question 4

Flourescence

Answer 4

The ability of certain chemicals to give off visible light after absorbing radiation which is not normally visible
Long light in class.

Question 5

Chemiluminescence

Answer 5

term for light that is generated as a product of a chemical reaction
Glow sicks

Question 6

Triboluminescence

Answer 6

Triboluminescence is a type of luminescence where a material produces light from friction, crushing, or other tearing
the glow producing by crushing sugar or rubbing quartz pieces together

Question 7

Light-Emitting Diode

Answer 7

a semiconductor device that emits light when an electric current is passed through it.

LED

Question 8

Order of the electromagnetic spectrum

Answer 8

Gamma rays, X-rays, Ultraviolet, Visible light(ROYGBIV), infared, microwaves, radiowave

Question 9

What are the laws of reflection

Answer 9

the angle of reflection is equal to the angle of incidence, also the incident ray, the reflected ray, and the normal to the surface all lie in the same plane.

Question 10

Define reflection

Answer 10

the throwing back by a body or surface of light, heat, or sound without absorbing it.

Question 11

Applications of Plain, concave and convex mirrors.

Answer 11

concave mirror is used as a reflector in torches, searchlights, and car headlights, and among other things.

convex mirror is used as a rear-view mirror in automobiles.

Dentist mirrors

Question 12

What does it mean when Di is positive vs negative

Answer 12

di is positive if the image is on the side opposite the object (i.e., real image); otherwise, di is negative (i.e., virtual image)

Question 13

What does it mean when Hi is positive vs negative

Answer 13

hi is positive if upright, negative if inverted.

Question 14

What does it mean when F is positive vs negative

Answer 14

For converging lenses, the focal length is always positive, while diverging lenses always have negative focal lengths.

Question 15

Formula for magnification

Answer 15

M=Hi/Ho=-Di/Do

Question 16

Formula for F

Answer 16

1/do + 1/di = 1/f

Question 17

Define refraction

Answer 17

Light being deflected through a medium from another medium.

Question 18

What is snell’s law

Answer 18

N1Sin01=n2sin02

Question 19

Does a higher index of refraction mean it refracts more or less

Answer 19

Refracts more.

Question 20

Does light refract away or closer to the normal when going from lower index of refraction to higher index of refraction

Answer 20

Towards the normal.

Question 21

what causes light to speed up and slow down in diffrent matterials

Answer 21

The greater the refractive index, the slower light travels through the material

Question 22

How to solve for N

Answer 22

N=C/V

Question 23

why are there 2 focal lengths in a lens but one in a mirror

Answer 23

A lens has two focal points, because a lens has two refracting surfaces. A mirror has only one reflecting surface and hence, it has only one focal point.

Question 24

Identify: Principle axis, axis of symmetry (normal), focal points (principle focal point and secondary focal point), focal
length, optical center.

Answer 24

PA is the line in the middle(Horizontal)
AOS is perpendicualr to the Mirror(Normal)
Focal point is F
Focal length is The distance between the focus and the optical center
Optical center is v

Question 25

Main parts of the eye

Answer 25

Cornea: clear outer part of the eye’s focusing system located at the front of the eye

Iris: coloured part of the eye.

Lens: clear part behind iris, helps focus light(convex)

Retina:Light is focused on the retina, The retina then converts these images to electric signals and sends them along the optic nerve to the brain.

Rods: Rods are responsible for vision at low light levels (scotopic vision). They do not mediate color vision, and have a low spatial acuity.

Cones: Cones are active at higher light levels (photopic vision), are capable of color vision and are responsible for high spatial acuity. The central fovea is populated exclusively by cones.

Question 26

What is nearsightedness and the proper name for it

Answer 26

Nearsightedness is a refractive error that makes far-away objects look blurry.( eye is too long or cornea curve is too steep.

Myopia

Question 27

What is farsightedness and the proper name for it

Answer 27

Farsightedness is a refractive error that makes nearby objects look blurry. (focuses behind the retina not on it.)

Hyperopia