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At what distance from a concave …

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At what distance from a concave mirror of focal length 10cm should an object 2cm long be placed in order to get an erect image 6cm tall

Posted by Royal ?? Chundawat 6 years, 2 months ago

CBSE > Class 10 > Science

4 answers

Royal ?? Chundawat 6 years, 2 months ago

Thanks yogita

0Thank You

Royal ?? Chundawat 6 years, 2 months ago

Thanks Adhya

0Thank You

Yogita Ingle 6 years, 2 months ago

Focal length of concave mirror f = -10 cm
Height of the object h_{o} = 2 cm
Height of the image h_{i }= 6 cm
Magnification m = h_{i}/h_{o} = 6/2 = 3 (erect image)
 m = -v/u
 3 = -v/u ⇒ v = -3u
Mirror formula: 1/v + 1/u = 1/f
 1/(-3u) + 1/u = 1/(-10)
 ⇒ u = -20/3 = -6.7 cm

1Thank You

Aadya Singh ? 6 years, 2 months ago

-6.7 cm..

2Thank You

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