Spherical Mirrors

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Focal Length

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Important Questions

An object of size 7 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained ? Find the size and the nature of the image.

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When an object is placed at a distance of 60 cm from a convex mirror, the magnification produced is 1/2. Where should the object be placed to obtain a magnification of 1/3?

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If the radius of curvature of a spherical mirror is 20 cm, then its focal length is _______ cm.

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The focal length of a concave mirror is where an object is to be placed so that its image is two times magnified, real and inverted :

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A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combination for the magic mirror from the top:

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Name the type of mirror used in the following situations:

a) Headlights of car

b) Solar furnaces

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Define (a) centre of curvature, (b) radius of curvature, (c) pole, (d)princip[al axis and (e) aperture of a spherical mirror with the help of a labelled diagram.

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A convex mirror has a focal length .A real object is placed at a distance in front of it from the pole, produces an image at:

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What is the relationship between focal length and radius of curvature ?

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A thin rod of length is placed along the optical axis of a concave mirror of focal length such that its image which is real and elongated just touches the rod. Calculate the magnification.

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