Question

a concave lines of focal lines 20 cm from an image at a

distance of 10 cm from lens what is the distance of object from the lions? also draw diagram​

Answer 1

$\huge{\underline{\sf{Question :-}}}}$

A concave lens of focal length 20 cm forms an image at a distance of 10 cm from the lens. What is the distance of the object from the lens? Also, draw ray diagram.

$\huge{\underline{\sf{Answer :-}}}}$

✮ Given,

• focal length, f = - 20 cm
• image distance, v = - 10 cm

(We know, Image formed by concave lens is virtual)

◉ To find:

object distance, u = ❓

◉ Now,

By using lens formula,

➩ $-1/u + 1/v = 1/f$

➩ $-1/u - 1/10 = - 1/20$

➩ $-1/u = - 1/20 + 1/10$

➩ $-1/u = 1/20$

or u = - 20

◉ Therefore,

The object is placed at 20 cm from the concave lens.

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Answer 2

Explanation:

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