• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Find out the focal length of the mirror through focusing the image of distant objects on the focal plane of the mirror.

Extracts from this document...

Introduction

C8 The Focal Length of a Concave Mirror Experiment 1 Capturing image of distant objects Aim: Find out the focal length of the mirror through focusing the image of distant objects on the focal plane of the mirror. Diagram of setup: Procedure: 1. The concave mirror is held facing distant objects outside an open window. The screen is moved between the mirror and the window until the images of the distant objects are focused on the screen. 2. The distance between the mirror and the screen is then measured, and this gives the focal length of the mirror. Precaution: 1. It should be the images of the distant objects that are to be captured rather than the images of the window frames. Results: The distance between the mirror and the screen where the image is the sharpest: 15cm The range of distance between the mirror and the screen where the image is sharp: 14.5 - 16cm Sources of error: 1. It is difficult to determine the sharpest image on the screen. ...read more.

Middle

Hence, the focal length of the mirror is determined. Precaution: 1. Make sure that the mirror is perfectly vertical. 2. If you cannot see the image of the pin, the probable reasons are (a) You are too close to the pin, less than the least distance of distinct vision, (b) The image occurs behind you (c) The pin is not along the principal axis of the mirror. Results: The distance between the mirror and the pin: 30.8cm Calculation/ Interpretation: The center of curvature of the mirror: 30.8cm The focal length of the mirror: 15.4cm Experiment 3 Locating the center of curvature using an illuminated object Aim: Find out the center of curvature of the mirror through focusing the image of center of curvature on the screen alongside the object. Diagram of setup: Procedure: 1. The lamp house is placed with an illuminated letter "F" in front of the mirror. The vertical position of the letter so that it is at the same level as the mirror. ...read more.

Conclusion

The object distance u and the image distance v is measured 2. Step 1 is repeated to capture 3 other diminished images and 4 other magnified images on the screen. In each case the object distance u and the image distance v is recorded. 3. A graph of 1/v against 1/u is plotted. The best-fit straight line is drawn and it is produced to intersect both axes. 4. The intercepts on both axes are found. The mean intercept is calculated. Hence, the focal length of the concave mirror is determined. Precaution: 1. Make sure that the mirror is perfectly vertical. Results: u 18cm 21cm 24cm 27cm 33cm 36cm 39cm 42cm v 81cm 50.9cm 40.3cm 30.7cm 27.5cm 26cm 23.5cm 21cm Calculation/ Interpretation: 1/u 0.055556 0.047619 0.041667 0.037037 0.030303 0.027778 0.025641 0.02381 1/v 0.012346 0.019646 0.024814 0.032573 0.036364 0.038462 0.042553 0.047619 Sources of error: 1. It is difficult to determine the sharpest image on the screen. We could often find a range of sharp images. Conclusion: There are a number of methods in finding the focal length of the concave mirror. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Sylvia Plath 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

See related essaysSee related essays

Related GCSE Sylvia Plath essays

  1. The mirror 3 diary entries.

    Tomorrow is my cousin's birthday and I was going to wear those clothes tomorrow. That's why I think that she gave me these clothes because we were going to have a party together. 1/7/86 Today was my cousin's birthday and we went to their house.

  2. Warning and mirror

    In the poem mirror, Sylvia Plath uses a lot of dull and negative words making old age sound terrifying "darkness" "drowned" and "terrible". Moreover the negative view of old age is also reflected by the mood and tone of the poem which is a cold and strict tone.

  1. 'Disaster in the Alps'- To compare the way three news publications, The Times, The ...

    This is because its target audience is mainly sophisticated and well-educated people. Unlike The Mirror, the headline, "20 die in cable car after jet cuts wire," does not sound as dramatic as The Mirror's. For example, the word "cuts" from The Times would not receive as an emotional response as "slices" would from The Mirror.

  2. Creative writing - Through The Mirror at Midnight.

    Lincoln stood up and glared at me. Mashed potatoes stuck to his buttons. Brown, slimy gravy dripped down his left sleeve. The meat loaf itself fell off his lap and onto the floor. "I - I'm so sorry! Really, Mr. Lincoln." I stammered. Mr. Lincoln's face went beetroot red.

  1. Through the Mirror At Midnight

    I awoke hearing a loud bang. I looked at my watch it was midnight already. What was that noise I heard? I glanced at the mirror, my eyes fixed on to the most nauseating thing. A bony, blue, rotting head, then an arm, and then a head came out of the mirror.

  2. Focal Length Of A Concave Mirror

    Graphical method * The two variables, and were substituted into the linear equation y = mx + c to form = - + . * The data was plotted on the graph versus , thus proving the relationship between the variables and the linear equation.

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