the speed of light = 299,792,458 m/s 
4) The SI unit of luminous flux is the lumen (lm). One lumen is defined as the luminous flux of light produced by a light source that emits one candela of luminous intensity over a solid angle of one steradian.
5) Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Specular reflection is defined as light reflected from a smooth surface at a definite angle, and diffuse reflection, which is produced by rough surfaces that tend to reflect light in all directions.
5) (see below)
6) A real image is formed when an object is farther from the converging lens than the focal length, so the light rays are refracted to a point on the opposite side of the lens. In contrast, a virtual image is when the object is closer to the lens than the focal length, so the rays diverge to the other side of the lens.
7) the mirror equation is 1/f = 1/do + 1/di, where f is the focal length, do is the object distance, and di is the image distance
8) Magnification = size of image / size of object
9) The primary colors are blue, green, and red. 
10) Polarized sunglasses reduce glare becausd the light is blocked and reflected as it travels through the lens into different directionsrather than directly into the wearer's eyes. 

λ = wavelength

ν = frequency
3. speed of sound:  331.2 metres per second 
speed of light 300000000 meters per second
4. luminous flux is the perceived power of light. The units are lumen (lm)
5. reflection is the change in direction of a wavelength. diffuse reflection is when the durface is not smooth so the lights bounces eveywhere.Specular reflection is when the surface is smooth so the lights bounced in the same direction.
5. see picture
6. A virtual image is when the outgoing rays from a point always diverge. A real image is when the outgoing rays converge. Flat mirrors produce virtual images.
7. concave lens go inwards convex lens go outwards
7. The mirror equation is 1/f = 1/do  + 1/di
f = focal length
do = object distance
di = image distance
8. m = - hi/ho
m = magnification
hi = size of image
ho = size of object
9. Red green and blue
10.  Sunglasses allow some types of light in and shun others. This reduces glare, so you can see better.

2)wave speed (metre per second) = frequency (hertz) × wavelength (metre)

3)The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. In dry air at 0 °C, the speed of sound is 331.2 metres per second. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics, and its exact value is 299,792,458 metres per second.

4)The SI unit of luminous flux is the lumen (lm). One lumen is defined as the luminous flux of light produced by a light source that emits one candela of luminous intensity over a solid angle of one steradian. In other systems of units, luminous flux may have units of power.

5)The reflection of light can be roughly categorized into two types of reflection: specular reflection is defined as light reflected from a smooth surface at a definite angle, and diffuse reflection, which is produced by rough surfaces that tend to reflect light in all directions

5)

6)A real image is formed when light rays originating from a point on one side of a lens (i.e. the object) are refracted by the lens so that they focus (come together) to a point on the other side of the lens at the image location.

7)A concave mirror converges light to a focal point. For lenses, light converges to a point for a convex lens. A convex mirror diverges light, as does a concave lens. 

7)1/f= 1/X+1/Y

f= focal length

X= object distance

Y= image distance

8) m = - hi/ho

m= magnification

ho= size of object

hi= size of image.

9) The primary colors of light are red, green, and blue.

10)The certain material in sunglasses can absorb light in all directions and lowers the intensity of the transmitted light by ½. The intensity of the light decreases due to Malus’s law. 

 

a= distance from object to source

b= distance from detector to object 

 9.  the primary colors are red blue yellow 
10. Polarized light waves that vibrate in one plane. polarized lens filter out certain types of reflected light  

Reflection is the throwing back by a body or surface of light, heat, or sound without absorbing it. Specular reflection is light reflected from a smooth surface at a definite angle. Diffuse reflection, is produced by rough surfaces that tend to reflect light in all directions

A real image is the image formed where the light rays are focussed. A virtual image is one from which the light rays appear to come but don't actually come from that image like in a mirror.

 

object distance (do), the image distance (di), and the focal length (f). 

image height (hi) and object height (ho)

Blue, Red, Yellow
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