Question

An object of 30 cm is placed in front of convex lens of focal length 20 cm find its position

Answer 1

Answer:

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QUESTION :

An object of 30 cm is placed in front of convex lens of focal length 20 cm find its position

SOLUTION :

Given that,

• Object distance (u) = - 30 cm.
• Focal length (f) = 20 cm.
• Image distance (v) = ?

By using " Lens Formula ..

⟹ 1/f = 1/v - 1/u

➡ 1/20 = 1/v - 1/(-30)

➡ 1/v = 1/20 - 1/30

➡ 1/v = 30 - 20/600

➡ 1/v = 10/600

➡ v = 600/10

➡ v = 60

Therefore, it's image distance is 60 cm.

➢ Magnification (m) = -v/u

➡ m = - 60/30

➡ m = -2

Hence, the image distance is 60 cm.

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Explanation:

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