Question

Question 17:- Arunima obtained a clear image of a candle flame on a white screen using a convex lens. She noted down the position of candle flame obtained on screen, convex lens and screen itself as follows: 1.Candle: 16cm 2.Screen:64cm 3.Convex lens:40cm Q11 D What will be the new position of candle with respect to convex lens, if it is shifted 12cm towards the lens? a) -28 cm b) 12cm c) -12cm d) 28cm​

Answer 1

Answer:

(A).Distance of object from lensu=50−26=24cm

Distance of the screen from the lensv=74−50=24

From lens formula,

v

1

−

u

1

=

f

1

24

1

−

−24

1

=

f

1

2

24

=−f

f=−12cm

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