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The above image shows a thin lens of focal length 5m.
(i) What is the kind of lens shown in the above figure?
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Answer:
The lens shown in the figure is a convex lens
(ii) If a real inverted image is to be formed by this lens at a distance of 7m from the optical centre, then show with calculation where should the object be placed?
Answer:
Given: f = 5m
v = 7m
1/f = 1/v-1/u
⅕ = 1/7-1/u
1/u = 1/7 - ⅕
= - 2/35
u= - 35/3 = - 17.5m
(iii) Draw a neatly labelled diagram of the image formation mentioned in (ii)
Answer:
The image will be placed 17.5cm on the left of the convex lens.
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