• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4

# The purpose of this laboratory investigation is to verify the validity of the Lens Equation which states that 1/di + 1/do = 1/f.

Extracts from this document...

Introduction

Lab: Applying the Lens Equation

Daniela Perdomo

Lab Partner: Stephanie Landers

Date: 21 November 2002

## Place: Graded School – São Paulo, Brazil

Time: 8:10 h – 9:35 h

Purpose/Introduction: The purpose of this laboratory investigation is to verify the validity of the Lens Equation which states that1/di + 1/do = 1/f, where di is the distance from the image to the lens, do is the distance from the object to the lens, and f is the focal length.

Hypothesis: The laboratory investigators hypothesized that the data obtained in the procedure of this experiment would be consistent with the Lens Equation. Though different methods of obtaining focal lengths (f) will be used throughout the lab, the obtained f’s should still be equal.

Materials:

• 2 double convex lenses
• 1 candle
• 1 box of matches
• 1 meter stick
• 1 lens holder
• 1 cardholder
• 1 candleholder
• 1 blank card

Diagram:

Procedure:

The first lens used in this investigation was a double convex lens, which indicates that light should converge when shone through it. The first way used to discover its focal length was by using sunlight. A cardholder, with a card in it, was placed on the meter stick and the lens holder, with the convex lens in it, placed in front of it (i.e. closer to where the sunlight was coming from).

Middle

(do)

Card distance

(di)

1/do

1/di

1/do + 1/di

(f)#

1

67.48 ± 0.1 cm

27.00 ± 0.5 cm

22.48 ± 0.2 cm

18.00 ± 0.6 cm

0.445

0.555

0.100

9.99 ± 0.4 cm

2

83.85 ± 0.1 cm

31.15 ± 0.5 cm

38.85 ± 0.2 cm

13.85 ± 0.6 cm

0.026

0.072

0.098

10.21 ± 0.5 cm

3

58.92 ± 0.1 cm

8.50 ± 0.5 cm

13.92 ± 0.2 cm

36.50 ± 0.6 cm

0.072

0.274

0.099

10.07 ± 0.9 cm

4

61.68 ± 0.1 cm

22.49 ± 0.5 cm

16.68 ± 0.2 cm

22.51 ± 0.6 cm

0.060

0.444

0.104

9.58 ± 0.4 cm

5

83.00 ± 0.1 cm

32.16 ± 0.5 cm

38.00 ± 0.2 cm

12.84 ± 0.6 cm

0.026

0.078

0.104

9.60 ± 0.6 cm

6

70.00 ± 0.1 cm

29.39 ± 0.5 cm

25.00 ± 0.2 cm

15.61 ± 0.6 cm

0.040

0.064

0.104

9.61 ± 0.4 cm

# Pleasenote: In trials 1-6 the lens was always placed at the 45.00 ± 0.

Conclusion

Suggestions: This laboratory experiment could have been improved by using optics benches instead of the flimsy metal clips and the meter stick used in this lab. Also, though it is impossible to focus on light from infinity, the investigators could have focused on something further away, such as a passing airplane. Perhaps a transparent light bulb could have been used instead and in this manner, the laboratory investigators could look at the light-producing wire, which does not shine as intermittently as candlelight does.

In addition to all of the above, some more trials could have been performed, and it would have been better to work with larger distances instead of being restrained by a meter stick, because although the same uncertainties would have been applied to the lens positions (all trials), card positions (Part A, “w/ candle”), and do(all trials), ± 0.1 cm uncertainty in a distance of, say, 5-meters would constitute a smaller margin of error than in merely a 1-meter distance.

This student written piece of work is one of many that can be found in our AS and A Level Microscopes & Lenses section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Microscopes & Lenses essays

1. ## Does the focal length of a lens depend on the colour of light used?

Smallest possible focal length = 0.183 x 0.8952 = 0.164(m) From these values I can see that the focal lengths of the red and blue light do overlap, in that the blue lights highest focal length (0.202(m)) is greater than red's smallest (0.170(m)).

2. ## In this experiment I will be investigating the efficiency of a motor. I hope ...

and the image distance (v), to two different converging lenses. I will do this by planning out how I will conduct the experiment: * Clear the work top * Setup the power supply and connect the ray box * Blue - Tack the metre rule to the work top, making

1. ## My experiments focus is to obtain an accurate measurement for a specific lenss power.

3.73 3.61 3.67 0.0606 325 -3.08 290 300 295 5 1.69 3.45 3.33 3.39 0.0575 300 -3.33 312 322 317 5 1.58 3.2 3.1 3.15 0.0498 275 - 3.63 341 354 347.5 6.5 1.87 2.93 2.83 2.88 0.0538 250 -4.00 392 410 401 9 2.24 2.55 2.43 2.49 0.0560 225

2. ## An investigation into the workings of the opticians

The retina also contains 'rods and cones' and is responsible for our peripheral vision as it is not the area that light is focused onto but light still hits it. The iris is responsible for controlling the amount of light entering the eye so as to prevent damage to the macula and retina.

1. ## Lenses experiment

inverted 3.1 1.55 10.0 16.0 Real magnified & inverted 3.1 1.55 10.0 16.0 Real magnified & inverted 3.1 1.55 10.0 18.0 Real magnified & inverted 2.1 1.05 10.0 18.0 Real magnified & inverted 2.3 1.15 10.0 18.0 Real magnified & inverted 2.1 1.05 10.0 18.0 Real magnified & inverted 2.3

2. ## This essay is on vision, its malfunctions &amp;amp; diagnostics methods.

The perception of depth is the ability to perceive the world in three dimensions1. Binocular disparity arises as each eye has a slightly different perspective of the object being viewed2. Therefore the closer the object, the more disparate the image. Thus binocular disparity is used as a binocular depth cue.

1. ## The focal length of a convex lens.

The distance between the lens and the screen was measured. This gave the focal length f of the lens. Experiment 2: Locating the focus using no-parallax method 1. The optical pin was placed close to the convex lens. The vertical position of the pin was adjusted so that its

2. ## Finding the Focal Length of a Lens.

As I found out in the pre-test, different coloured light has different focal lengths. The speed of light in any specific medium is constant. As the wave equation says: v - Velocity � - Frequency ? - Wavelength and the frequency of light didn't change, or at least not a

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to