Question

An object is placed at a distance 20 cm from a convex lens of focal 10 cm. Find the image distance Length and nature of the image.

Answer 1

Answer:

Image distance is 20 cm and it is real and inverted.

Explanation:

1

Secondary School Physics 5 points

An object is placed at a distance 20 cm from a convex lens of focal length 10 cm.Find the image distance and nature of the image.

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Answers

ARJUNTHEKIND

ARJUNTHEKIND Ambitious

Answer:

Here we have, U(object distance) = -20cm F(focal length) ... Find the nature and position of the image? .... A convex lens of focal 15 cm is placed on a plane mirror .

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Comments Report

muscardinus Ambitious

Image distance is 20 cm and it is real and inverted.

Explanation:

It is given that,

Object distance from the convex lens, u = -20 cm

Focal length of the convex lens, f = +10 cm

If v is the position of image with respect to the mirror. 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 will be formed at a distance of 20 cm behind the lens. If m is the magnification of the lens,

m=\dfrac{v}{u}

m=\dfrac{20}{-20}

m = -1 (image is real and inverted)

Answer 2

Answer:

Distance of an object u = 20 cm Focal length of a convex lens f = 10 cm Let the image distance be v We know v = 20 cm Magnification m = v u vu = 20 20 2020 = 1 Hence a real image of same size is formed at 20 cm. Image distance = 20 cm