Optics

Question 1

Scientific notation

Answer 1

Used for recording very large or very small numbers. The numbers of digits you write shows the accuracy of the measurement. You should include all significant digits.

Question 2

Significant digits

Answer 2

It is important to know how many figures in your data are significant, because it can affect the accuracy of your results. You should only report your answer to the lowest number of significant figures in your measurements. You will need to round your answer to reflect the appropriate number of significant digits

Question 3

How do you determine which digits are significant?

Answer 3

1. All non-zero numbers are significant
2. All zeros between non-zero numbers are significant
3. All trailing zeros are NOT significant if there isn’t a decimal
4. If just a zero comes before the decimal it isn’t significant
5. All zeros after a non-zero number and after a decimal are significant

Question 4

How to add and subtract with significant digits

Answer 4

Report the same number of decimal places as your least accurate measurement. The answer must contain the same amount of digits following the decimal for
the least accurate value

Question 5

How to multiply and divid with significant digits

Answer 5

Repon the same number of significant digits (total) as your least accurate measurement. The answer must contain the same amount of significant figures as the number with the least significant figures

Question 6

What is ROY G BIV

Answer 6

Red
Orange
Yellow
Green
Blue
Indigo 
Violet

Question 7

What is luminous

Answer 7

If an Object is luminous, then it gives Off light (the sun)

Question 8

What is non luminous

Answer 8

If an Object iS non-luminous, it does not give off light (the moon).

Question 9

What are the different types of light

Answer 9

Incandescent
LED
Fluorescence
Triboluminescence
Bioluminescence 
Chemiluminescence
Phosphorescence
Electric discharge

Question 10

Incandescent

Answer 10

Light produced from high temperatures (tungsten wire burning in a lightbulb), not effcient- emits a 10t Of heat

Question 11

LED

Answer 11

Light emitting diode, very eMCient - does not emit heat

Question 12

Fluorescence

Answer 12

Absorbs UV light and then emits it

Question 13

Triboluminescence

Answer 13

Due to friction - crystals are scratched or rubbed

ex. Wintergreen lifesavers

Question 14

Bioluminescence

Answer 14

Chemical reaction in living organisms, little heat produced (ex. Firefly)

Question 15

Chemiluminescence

Answer 15

Chemical reaction, little heat (ex. Glowstick)

Question 16

Phosphorescence

Answer 16

UV energy is absorbed and slowly resealed as light (ex. Glow in the dark toys)

Question 17

Electric discharge

Answer 17

Electrical conductors through a gas (ex. Neon of helium signs)

Question 18

What are the laws of reflection

Answer 18

1. The angle of incidence equals the angle of reflection

2. The incident ray, the reflected ray and the normal all lie on the same plane

Question 19

What is SALT

Answer 19

Size - larger, same, or smaller
Attitude - upright or inverted
Location - object to image
Type - virtual or real

Question 20

How do you locate an image on a plane mirror

Answer 20

To find an image you need to send multiple incident rays towards the mirror and then extend the reflected rays. Where they cross represents the location of the image.

Question 21

How do you draw what your eye sees in the mirror

Answer 21

Light ray from object to mirror reflected to the eye (,=). Extend reflected ray to eye behind the mirror (use dotted lines to show “virtual”). When extended reflected rays meet equals that point a