JAMB 2024 Whatsapp Group - Join us here
JAMB CBT Software 2024 - Free Download

2021 WAEC Physics Practical   You have been provided with a ray box, a converging lens, a lens holder,...

Physics
WAEC 2021

Open photo

 

You have been provided with a ray box, a converging lens, a lens holder, a screen, a metre rule, and half- metre rule. Use the diagram above as a guide to perform the experiment.

(i) Determine the approximate focal length f, of the lens by focusing a distant object on the screen.

(ii) Place the ray box and the screen such that the distance between the illuminated cross-Wire and the screen, D= 150 cm.

(iii) Place the lens at a position L where a sharp mage of the cross-Wire Is obtained on the screen Note L.

(iv) Move the lens at a position L, to 0btain another sharp image of the cross-wire on the screen. Note L

(V) Measure the distance, d. between L\(_1\) and L\(_2\).

(Vi) Evaluate D\(^2\): d\(^2\) and D\(^2\) - d\(^2\).

(vii) Repeat the procedure for four other values of D = 130cm, 100 cm, 90 cm and 80 cm. in each case.evaluate D\(^2\); d\(^2\) and D\(^2\) - d\(^2\).

(viii) Tabulate the result

(ix) Plot a graph with D\(^2\) - d\(^2\) on the vertical axis and  D on the horizontal axis.

(x) Determine the r values of D axis and  Determine the slopes, S, of the graph.

(xi) Evaluate k = \(\frac{s}{4}\)

(xii) State two precautions taken to ensure accurate results.

(bi) Distinguish between a virtual image and. plain image?

(ii) With the aid of a ray diagram, explain how a converging lens produces a Virtual image

 

JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!
JAMB CBT Software 2024 - Free Download
JAMB CBT Mobile App 2024 - Free Download
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
JAMB 2024 Whatsapp Group - Join us here
Explanation

 

Open photo

 

Slope = \(\frac{Δd^2/d^2}{ΔD^{-1}\) → \(frac{y_2 - y_1}{x_2 - x_1}\) 

= \(\frac{0.4697 - 0.6638}{0.431 - 0.0254}\)

S = \(\frac{-0.1941}{0.0177}\) → -10,97

 K = \(\frac{s}{4}\) → \(\frac{-10.97}{4}\)

= 2.74

Precautions:
(i) Lens was placed vertically on the lens holder. (ii) Avoided zero error in reading my metre rule.

Open photo

 

 

Open photo

(b)(ii) Differences between real and virtual images:

(i) Real image is formed on the screen while virtual image cannot be found on the screen. (ii) Real images are inverted while virtual images are erect.

 

 

 

 

 

 

 

 

 

 

 


Report an Error Ask A Question Download App
JAMB CBT Mobile App 2024 - Free Download
JAMB CBT Software 2024 - Free Download
JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
JAMB 2024 Whatsapp Group - Join us here

Contributions ({{ comment_count }})

Please wait...

{{ settings.no_comment_msg ? settings.no_comment_msg : 'There are no comments' }}

Quick Questions

Post your Contribution

Please don't post or ask to join a "Group" or "Whatsapp Group" as a comment. It will be deleted. To join or start a group, please click here

{{ quote.posted_by.display_name }}
{{ settings.form_textarea_description }}
 
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
JAMB 2024 Whatsapp Group - Join us here
JAMB CBT Mobile App 2024 - Free Download
JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!
JAMB CBT Software 2024 - Free Download
JAMB CBT Software 2024 - Free Download
JAMB CBT Mobile App 2024 - Free Download
JAMB 2024 Whatsapp Group - Join us here
JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!