Name Chapter 30 Lenses Percent Transmission of Light 100% of the light that strikes it through the lens. Consider the two lenses No glass lens is perfectly transparent, that is, the lens does not transmit in a telescope, the objective lens and the eyepiece lens. If the objective lens transmits 96% of the light, and the eyepiece lens transmits 97%, what percent of light from a distant source reaches your eye? 1. Read and Understand What information are you given? Transmission of objective lens = 96% Transmission of eyepiece lens = 97% 2. Plan and Solve What unknown are you trying to calculate? Percent of light transmitted through two-lens system = ? What formula contains the given quantity and the unknown? Transmitted light = Incident light x Percent transmission Substitute the known values and solve. For light passing through two lenses, multiply the incident light by the percent transmission of each lens. Assume the amount of incident is unity, or 1. Transmitted light = Incident light X Percent transmission objective Percent transmission eyepiece Transmitted light = 1 x 0.96 x 0.97 Transmitted light = 0.93 or 93% of the light passes through the two-lens system 3. Look Back and Check Is s your answer reasonable? Yes, it makes sense that the amount of light that passes through is less than the percent transmission value for each lens. Math Practice On a separate sheet of paper, solve the following problems. 1. The diaphragm of a digital camera limits the lens opening to allow only 50% of the incident light to enter the lens. If the percent transmission of the multi-lens optical system used in the camera is 88%, what percent of the total incident light makes its way to the electronic sensor? บ

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter38: Refraction And Images Formed By Refraction
Section: Chapter Questions
Problem 80PQ: CASE STUDY A group of students is given two converging lenses. Lens A has a focal length of 12.5 cm....
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Name
Chapter 30 Lenses
Percent Transmission of Light
100% of the light that strikes it through the lens. Consider the two lenses
No glass lens is perfectly transparent, that is, the lens does not transmit
in a telescope, the objective lens and the eyepiece lens. If the objective
lens transmits 96% of the light, and the eyepiece lens transmits 97%, what
percent of light from a distant source reaches your eye?
1. Read and Understand
What information are you given?
Transmission of objective lens = 96%
Transmission of eyepiece lens = 97%
2. Plan and Solve
What unknown are you trying to calculate?
Percent of light transmitted through two-lens system = ?
What formula contains the given quantity and the unknown?
Transmitted light = Incident light x Percent transmission
Substitute the known values and solve.
For light passing through two lenses, multiply the incident light by the
percent transmission of each lens. Assume the amount of incident is
unity, or 1.
Transmitted light = Incident light X Percent transmission objective
Percent transmission eyepiece
Transmitted light = 1 x 0.96 x 0.97
Transmitted light = 0.93 or 93% of the light passes through the two-lens system
3. Look Back and Check
Is
s your answer reasonable?
Yes, it makes sense that the amount of light that passes through is less
than the percent transmission value for each lens.
Math Practice
On a separate sheet of paper, solve the following problems.
1. The diaphragm of a digital camera limits the lens opening to allow only
50% of the incident light to enter the lens. If the percent transmission of
the multi-lens optical system used in the camera is 88%, what percent of
the total incident light makes its way to the electronic sensor?
บ
Transcribed Image Text:Name Chapter 30 Lenses Percent Transmission of Light 100% of the light that strikes it through the lens. Consider the two lenses No glass lens is perfectly transparent, that is, the lens does not transmit in a telescope, the objective lens and the eyepiece lens. If the objective lens transmits 96% of the light, and the eyepiece lens transmits 97%, what percent of light from a distant source reaches your eye? 1. Read and Understand What information are you given? Transmission of objective lens = 96% Transmission of eyepiece lens = 97% 2. Plan and Solve What unknown are you trying to calculate? Percent of light transmitted through two-lens system = ? What formula contains the given quantity and the unknown? Transmitted light = Incident light x Percent transmission Substitute the known values and solve. For light passing through two lenses, multiply the incident light by the percent transmission of each lens. Assume the amount of incident is unity, or 1. Transmitted light = Incident light X Percent transmission objective Percent transmission eyepiece Transmitted light = 1 x 0.96 x 0.97 Transmitted light = 0.93 or 93% of the light passes through the two-lens system 3. Look Back and Check Is s your answer reasonable? Yes, it makes sense that the amount of light that passes through is less than the percent transmission value for each lens. Math Practice On a separate sheet of paper, solve the following problems. 1. The diaphragm of a digital camera limits the lens opening to allow only 50% of the incident light to enter the lens. If the percent transmission of the multi-lens optical system used in the camera is 88%, what percent of the total incident light makes its way to the electronic sensor? บ
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