Which of the following can be used to find the focal length of a lens (a) Light from the sun (b) Light from a distant tree (c) Light from the window of our lab. d) Object at a distance of 0 cm for a focal length of 30 cm

Answers (1)
S safeer

For accurate calculation objects at a large distance (infinity) can be used. From the given options light from a sun and distant tree can be used.

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