MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Grade: 11
        

In an experiment to measure the focal length of concave mirror it was found that for an object distnace of 0.30 m, the image distance come out to be 0.60 m. Determine focal length with error limits.

10 years ago

Answers : (1)

Ramesh V
70 Points
							

Case 1: If we take vernier callipers, its least count  is : dv = du = 0.01cm = 10-4m

Case 2: If we take meter scale, its least count  is : dv = du = 0.1cm = 10-3m

v-image distance

u-object distance

f-focal length

then 1/v + 1/u = 1/f

for v=0.6m and u=0.3m , we have (from above formula) f = 0.2m

on differentiating above eqn. for error analysis, we have

 -dv/v2 -du/u2 =  -df/f2

Case 1(vernier scale):  df = f2( dv/v2 +du/u2 )

                                                = 0.04*(1/0.36 + 1/0.09)*10-4m

                                                = 5.56x10-5 m

                                    focal length limits are : ( 0.2 ± 5.56x10-5 ) mts

Case 2(metee scale):  df = f2( dv/v2 +du/u2 )

                                              = 0.04*(1/0.36 + 1/0.09)*10-3m

                                              = 5.56x10-4 m

                                      focal length limits are : ( 0.2 ± 5.56x10-4 ) mts

---

Please feel free to post as many doubts on our disucssion forum as you can. If you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation. All the best.

Regards,
Naga Ramesh
IIT Kgp - 2005 batch

 

 

10 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies


Course Features

  • 731 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution


Course Features

  • 18 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details