# data[].attributes.body
1/f = 1/di + 1/do
1/f = 1/20 + 1/36
1/f = 7/90
f/1= 90/7
f= 12.9 cm

# data[].attributes.body
22cm/ 2= 11cm

# data[].attributes.body
1/f=1/di + 1/do
1/12= 1/30 + 1/do
1/12 - 1/30= 1/20
20/1=f/1
20=f

# data[].attributes.body
0.75 x 2 =
1.5m

# data[].attributes.body
No angle of refraction

# data[].attributes.body
sin(3) / sin(20) =
1.46

# data[].attributes.body
sin(40)/ sin(1.65) =
22.32 degrees

# data[].attributes.body
3x10^8/ 2.51x10^8
=1.195 round the number and get 1.20.
the answer is 1.20 x 10^8

# data[].attributes.body
decreases

# data[].attributes.body
x-rays, light, infrared

# data[].attributes.headline
6) If total interval reflection occurs at a glass to air surface

# data[].attributes.subject
6) If total interval reflection occurs at a glass to air surface

# data[].attributes.headline
10) A candle was placed 36 cm from a converging lens. the image of the candle was inverted and appeared 20 cm from the lens. What is the focal length of the lens 

# data[].attributes.subject
10) A candle was placed 36 cm from a converging lens. the image of the candle was inverted and appeared 20 cm from the lens. What is the focal length of the lens 

# data[].attributes.headline
9) What is the focal length of a mirror whose radius of curvature is 22 cm?

# data[].attributes.subject
9) What is the focal length of a mirror whose radius of curvature is 22 cm?

# data[].attributes.headline
8) A concave mirror with a focal length of 12 cm creates a real image 30 cm away on it principal axis; the corresponding object is located how far from the mirror ?

# data[].attributes.subject
8) A concave mirror with a focal length of 12 cm creates a real image 30 cm away on it principal axis; the corresponding object is located how far from the mirror ?

# data[].attributes.headline
5) A ray in the air is incident on a glass boundary at an angle of 30 degrees and is refracted in the glass at 20 degrees with the normal. what is the index of refraction of the glass ?

# data[].attributes.subject
5) A ray in the air is incident on a glass boundary at an angle of 30 degrees and is refracted in the glass at 20 degrees with the normal. what is the index of refraction of the glass ?

# data[].attributes.headline
7) If you stand 0.75 meters in front of a plane mirror, what is the apparent distance between you and your image ?

# data[].attributes.subject
7) If you stand 0.75 meters in front of a plane mirror, what is the apparent distance between you and your image ?

# data[].attributes.headline
4) A ray of light in the air is incident on a glass boundary at an angle of 40 degrees with the normal. If the index of refraction of the glass is 1.65, what is the angle of the refraction in the glass ?

# data[].attributes.subject
4) A ray of light in the air is incident on a glass boundary at an angle of 40 degrees with the normal. If the index of refraction of the glass is 1.65, what is the angle of the refraction in the glass ?

# data[].attributes.headline
3) If a diamond has an index of refraction 2.51, what is the speed of light through this object ? 

# data[].attributes.subject
3) If a diamond has an index of refraction 2.51, what is the speed of light through this object ? 

# data[].attributes.headline
2) When light enters a piece of glass from air, its speed ______

# data[].attributes.subject
2) When light enters a piece of glass from air, its speed ______

# data[].attributes.headline
1) Give 3 Examples of electromagnetic radiation? 

# data[].attributes.subject
1) Give 3 Examples of electromagnetic radiation? 