Question

an object is placed at a distance of 20 cm from a convex lens of focal length 10cm the image is formed on other side of the lens at a distance​

Answer 1

Answer:

this is the correct answer because it is at the center ( c )

Answer 2

The image is located at a distance of 20 cm from the convex lens.

Explanation:

It is given that,

Object distance, u = -20 cm

Focal length of the convex lens, f = +10 cm (for convex lens it is positive)

(a) Let the object is placed at a distance of v from the lens. It can be calculated using lens formula as :

$\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

$\dfrac{1}{v}=\dfrac{1}{f}+\dfrac{1}{(u)}$

$\dfrac{1}{v}=\dfrac{1}{10}+\dfrac{1}{(-20)}$

v = 20 cm

So, the image is located at a distance of 20 cm from the convex lens. Hence, this is the required solution.

Learn more,

Mirror's formula

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