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neonofarm [45]
4 years ago
10

You view your face in a concave mirror of focal length 20 cm and wish it to be magnified by a factor of 1.5. What should you do?

Physics
1 answer:
Oduvanchick [21]4 years ago
3 0

Answer:

u = 6.667 cm

Explanation:

given,

Focal length of the concave mirror, f = 20 cm

magnification factor = 1.5  

we know,

M = \dfrac{-v}{u}

v is the distance of the image

u is the distance of the object

1.5 = \dfrac{-v}{u}

v = -1.5 u

Using mirror formula

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

\dfrac{1}{f}= \dfrac{1}{u} - \dfrac{1}{1.5u}

\dfrac{1}{20}=\dfrac{1}{3u}

3u = 20

u = 6.667 cm

distance of the person from the mirror is equal to 6.667 cm.

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