Optics Quiz

Question 1

Concave Mirror

Answer 1

Reflection is from the inner surface; center bulges inward, away from you.

Question 2

Convex Mirror

Answer 2

Reflection is from the outer surface, center bulges outward, towards you.

Question 3

Able to treat cancer

Answer 3

Gamma rays

Question 4

UV Light

Answer 4

Causes skin to tan and burn, causes skin cancer(carcinogen), stimulates the production of vitamin D.

Question 5

Incandescent

Answer 5

Production of light as a result of high temps. As the object gets hotter, the colour changes from red, to orange, to yellow, to white, to blue-white. Use tungsten (glows as electricity flows through it), only uses 5-10% of electricity going through it - inefficient.

Question 6

Electrical Discharge

Answer 6

Producing light by passing an electric current through gas; electricity causes gas to glow, neon makes red light, helium makes gold, argon makes a pale violet-blue, krypton makes a grey colour.

Question 7

Phosphorescence

Answer 7

Producing light by the absorption of UV light, results in emission of visible light over a long period of time; ex. glow-in-the-dark stickers.

Question 8

Florescence

Answer 8

The immediate emission of visible light as a result of the absorption of UV light
Ex. highlighters and some detergents contain fluorescent dyes. A fluorescent light tube (CFLs) is filled with a very low-pressure mercury vapour . When electric current passes through the tube, the mercury atoms emit UV light - 4 to 5 times more energy efficient than incandescent bulbs, but are much more expensive to purchase.

Question 9

Chemiluminescence

Answer 9

Direct production of light as the result of a chemical reaction with little or no heat produced. Also called cold light. Does not require an electric current and has no moving parts. Ex. light stick, glow sticks.

Question 10

Bioluminescence

Answer 10

The production of light in living organisms as the result of a chemical reaction with little or no heat produced. Examples: fireflies, glow-worms, anglerfish

Question 11

Triboluminescence

Answer 11

The production of light from friction as a result of scratching, crushing, or rubbing certain crystals

Question 12

LEDs

Answer 12

An electronic device that uses semiconductors that allows current to flow in one direction. Does not require filament, does not produce much heat; and is more energy-efficient.

Question 13

Principle axis

Answer 13

The line going through the centre of curvature and the centre of the mirror. Since the principal axis goes through the centre of the circle, the axis is the radius of the circle

Question 14

Vertex / point of incidence

Answer 14

Point where the principal axis meets the mirror - labelled V

Question 15

Geometric optics

Answer 15

The use of light rays to determine the path of light when it strikes an object.

Question 16

Incident light

Answer 16

The light emitted from a source that strikes an object.

Question 17

Focus

Answer 17

Point at which light rays parallel to the principle axis converge (meet at a common point) when they are reflected off a concave mirror. It is labelled F.

Question 18

Order of electromagnetic spectrum.

Answer 18

RMI V UXG