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An object is placed 18cm in …

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An object is placed 18cm in front of a spherical mirror. If the image is formed at 4 cm to the right of the mirror. Calculate its focal length,radius of curvature of the mirror. Is the mirror concave or convex. What is the nature of the image?

Posted by Aditi Ringusia 4 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 6 months ago

u = - 18 cm
v = 4 cm
1 / f = 1 / v + 1 / u
1 / f = 1 / 4 + 1 / (- 18)
1 / f = 1 / 4 - 1 / 1 8
1 / f = 9 - 2 / 36 = 7 / 36
f = 36 / 7 cm
focal length is positive so mirror is convex.
R = 2 × 36 / 7
= 72 / 7 cm

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