13yup...sumthing missing i think....may be
the graph between distance u and image distance v for a lens is given below . the focal length of lens is (a) 5 ± 0.1 (b) 5 ± 0.05
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12 Answers
621/v-1/u=1/f
f=5
|1/v2dv|+|1/u2du|=1/f2df
|(f/v)2dv|+|(f/u)2du|=df
When we take v=10, u = 10
du=dv=0.1 (there were 10 lines drawn on x axis and y axis to show accuracy)
df=1/2du=.05
So the answer should be b!
I saw the FIITJEE solution they have marked a) But I am not convinced by their solution! :)
FIITJEE's solution follows..
decide for yourself.. or tell me my error.
1sorry guys.............. now i have edited............ but wat does this dotted line represents
62which year did this question come?
May be I wud like to look at the question myself!
62looking from this my guess will be
b
bcos there are 20 intervals made by the 10 dashes you have made!
1bro mujse question theek tarah se upload nai ho ra. it was asked in 2006
1bro wo ques arihant ki 30 years iit physics mein dia tha lekin dotted lines 10 and 11 k beech mein hain......... mene f to nikaal lia lekin delta f , delta u and delta v ka chakkar pad ra hai. sol. to muje samajh nai aaya and answer 'b' dia hai