Question

Find the focal length of a convex lens which produces a real image at 60 cm from the lens when an object id placed at 40 cm in front of the lens.

Answer 1

According to sign convention :
Image distance (V) = 60cm
Object distance (U) = -40cm
Focal length. (F) = ?
Lens formula:
• 1/F = 1/V - 1/U
= 1/F = 1/60 - 1/-40
= 1/F = 1/60 + 1/40
= 1/F = 2+3/120
= 1/F = 5/120
= 5F = 120
= F = 120/5 = 24
= F= 24cm
°°°Focal length = 24cm...

Answer 2

Answer:

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Explanation:

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