Question

A concave mirror has focal length 10cm John is looking at a screen placed 15 cm from the mirror will rule Ravi is looking into the mirror standing beside John both are waiting to see an image while Rahul is holding a pan hundred CM away from the mirror and bring it close to the mirror along the principal Axis how far from the mirror will the pen be when John will see the image obtained Ravi will see the image who will see theenlarge anderect image

Answer 1

Explanation:

its on the picture you can see the explanation. and answer of the question is -11.11 cm.

Answer 2

The image distance is 30 cm

Explanation:

Given that,

Focal length = 10 cm

Object distance = 15 cm

We need to calculate the image distance

Using formula of mirror

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

Where, v = image distance

u = object distance

Put the value into the formula

$\dfrac{1}{-10}=\dfrac{1}{v}+\dfrac{1}{-15}$

$\dfrac{1}{v}=\dfrac{1}{-10}+\dfrac{1}{15}$

$\dfrac{1}{v}=-\dfrac{1}{30}$

$v=-30\ cm$

Negative sign shows the image formed behind the mirror

Hence, The image distance is 30 cm

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Topic : Optics

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