Question

A student focused the image of a candle flame on a white screen by placing the fame a
distances from a concave mirror. He noted his observations in the following table :
Distance of mirror from screen (cm) 20 24 30 40 70
Distance of flame from mirror (cm) 60 40 30 24 12
Analyse the above data and answer the following questions.
A) What is the focal length of the mirror ?
(B) Which set of observation is incorrect and why?
C) Draw the ray diagram to show the image formation for any correct set of observation​

Answer 1

Answer:

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abhi178

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you can see, case (iii) ; here both the object and the image distances are 30cm .but we know this is possible only case when object kept at 2f ,so, 2f = 30cm => f = 15cm

(b) use lens formula for finding incorrect observations.

1/v - 1/u = 1/f

see last observation (v)

u = -15

f = +15

then, 1/v = 1/15

Explanation:

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