A candel 10cm in lenthis placed …

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A candel 10cm in lenthis placed vartically at a distance of 20cm from a concave mirror of focal length 15cm . At what distance from the mirror will the screen be position in order to obtain a sharp image ? Find the size of the image

Posted by Trilok Singh 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Little Master 2005 5 years, 6 months ago

Height of object =10 cm u=-20cm .....sign convention rules f=-15cm..........sign convention rules v=?? Height of image =?? By using mirror formula, 1/f=1/v+1/u 1/-15=1/v+1/-20 1/v=1/-15-(1/-20) 1/v=-1/15+1/20 1/v=-4/60+3/60 1/v=(-4+3)/60 1/v=-1/60 v=-60 cm Magnification =-v/u =-(-60)/-20 =60/-20 =-3 ....minus sign states that the image formed is smaller than the object. Height of image /Height of object =magnification Height of image=magnification *Height of object Height of image =3 *10 ...no need to take minus sign as it only shows that image is smaller =30 cm

1Thank You

Lucifer ? Morningstar? 5 years, 6 months ago

Ho=-30 cm

0Thank You

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Posted by Pandey Ji 5 months, 3 weeks ago

CBSE > Class 10 > Science