Question

Sign Deviation For Concave And Convex (Lens And Mirror)

Answer 1

Answer:

Virtual images are always formed by convex mirrors and are formed by concave mirrors when the object is placed in front of F. ... Plane mirrors and convex mirrors will always produce an upright image. A concave mirror will only produce an upright image if the object is located in front of the focal point.

Explanation:

Answer 2

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CBSE Class 12-science - Ask The Expert

Answered

what is the sign conventions for concave mirror and concave lens and convex mirror and convex lens ?

Asked by Upendra Ks | 2nd Mar, 2014, 11:29: AM

Expert Answer:

Sign convention in the case of concave mirror:

Since, object is always placed in front of the mirror hence the sign of object is taken as negative.

Since, the centre of curvature and focus lie in front of the concave mirror, so signs of radius of curvature and focal length are taken as negative in the case of concave mirror.

When image is formed in front of the mirror, the distance of image is taken as – (negative) and when image is formed behind the mirror, the distance of image is taken as + (positive).

Height of image is taken as positive in the case of erect image and taken as negative in the case of inverted image.

Sign convention in the case of a convex mirror:

Since, object is always placed in front of the mirror hence the sign of object is taken as negative.

Since, the centre of curvature and focus lies behind the convex mirror, so sign of radius of curvature and focal length are taken as + (positive) in the case of convex mirror.

In the case of convex mirror, image