Solving Physics Lab Report Questions

AI Thread Summary
The discussion revolves around two physics lab report questions related to optics. For the first question, the user is trying to determine the focal length of a projection lens needed to project a 12 ft wide image from a 1-inch wide film at a distance of 50 ft. The user is uncertain about the correct values for object distance (u) and image distance (v) in the lens formula. In the second question, the user is calculating the focal lengths of the objective and eyepiece lenses of a 24-inch long telescope with a magnifying power of 15, but is unclear on how to incorporate all parameters into the calculation. The user seeks clarification on these concepts to complete the lab report.
SpatialVacancy
Messages
24
Reaction score
0
Hello,

I have just finished what seems like an infinite amount of questions for this lab report. 2 of them I am just not sure how to proceed. Any help would be appreciated.

Question 1:
In a film projection apparatus, it is desired to produce pictures 12 ft wide on a screen 50 ft from the lens. The size of the picture on the film is 1 in. wide. What must be the focal length of the projection lens used?

Question 2:
The magnifying power of an astronomical telescope 24 in. long is equal to 15. Determine the focal length of the objective lens and that of the eyepiece. Assume the telescope is focused on a distant object.

Thank you.
 
Physics news on Phys.org
1) Because 1/u + 1/v = 1/f, from what I understand u = 50ft and v = 1 inch (Could be wrong..)

2) Guessing here, but Power of lens = 1/focal length, thus 15 = 1/f, 15f = 1, f = 1/15
 
Im not sure that is right. How does it take into consideration the other parameters of the problem?
 
That's exactly where my uncertainty comes from..
I'll have to get back to you on this one.
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

How to measure the magnification of a microscope in the lab
Replies
12
Views
3K
How Do I Calculate Uncertainty in My Physics Lab Report?
Replies
17
Views
10K
How Does the Galileoscope's Optical Design Affect Its Viewing Capabilities?
Replies
1
Views
2K
Solving Film Projection & Telescope Questions
Replies
1
Views
2K
Biology Lab Microscope Magnification Calculations
Replies
1
Views
3K
Other Coping with Lab Reports as a Physics Major
Replies
4
Views
4K
Navigating Physics I Lab Reports: Principal Results & Sources of Uncertainty
Replies
2
Views
2K
I How Do You Calculate Error with a Single Measurement in Physics Lab Reports?
Replies
5
Views
2K
Lab report questions, gas thermometer
Replies
3
Views
6K
Centripetal Force Lab Questions?
Replies
2
Views
3K

Hot Threads

Recent Insights

Back
Top