Question

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Physics"
Question: -
À connex cens forma a real image on a
screen when object is placed at 10 cm from
he screen. On shifting the lens by 2 cm, a
real image is again formed on the screen,
Find the focal length of the lens.
Answer: -​

Answer 1

f= (D)2-(∆)2/4D

this is formula of finding focal length using displacement method.

f:− focal length

Δ:− displacement of lens done in order to get image again on screen.

D:− distance between object and screen.

f= (10)2-(2)2/4×10

f= 2.4cm

Answer 2

Step-by-step explanation:

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