Focal length, radius of curvature, image...

Focal length, radius of curvature, image distance, size of image.

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Size of image All the other distances are measured from optical cntre along the principal axis while size of image is measured perpendicular to the axis.

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An object of size 2.0 cm is placed perpendicular to the principal axis of a concave mirror. The distance of the object from the mirror equals the radius of curvature. The size of the image will be

0.5 cm

1.0 cm

1.5 cm

2.0 cm

A convex lens of focal length f produces a virtual image n times the size of the object. Then the distance of the object from the lens is

`(n-1)f`

`(n+1)f`

`((n-1)/(n))f`

`((n+1)/(n))f`

An object 2.5 cm high is placed at a distance of 10 cm from a concave mirror of radius of curvature 30 cm The size of the image is

9.2 cm

10.5 cm

5.6 cm

7.5 cm