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Chapter 34: Q. 39 (page 991)

An object is 12cmin front of a concave mirror with a focal length of 20cm. Use ray tracing to locate the image. Is the image upright or inverted?

Short Answer

Expert verified

The picture is 30cmbehind the mirror, upright, and at a distance of 30cm.

Step by step solution

01

Step: 1 Principles:

Ray 1is reflected via the focus point and drawn parallel to the optical axis.

Ray 2is reflected parallel to the optical axis after passing past the focus point (or as if emanating from the focal point if s<f).

Ray 3passes through the mirror's centre and reflects at an angle of similar magnitude on the opposite side of the optical axis.

02

Step: 2 Datas:

The data's are,

Concave mirror

Distance object to mirror is s=12cm.

Focal length is f=20cm.

03

Step: 3 Tracing:

The ray-tracing diagram is shown in Figure. A scale is placed on the optical axis. The focal point of the mirror is drawn and noted. With its base on the optical axis, the item is represented as an arrow. The three specific rays specified in the Concepts and Principles section are drawn from the tip of the arrow. The image's tip is the spot where the three rays converge.

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