Question

The diagram shows a concave mirror. Identify the labelled parts.

A. X = centre of curvature, Y = vertex, Z = focus

B. X = centre of curvature, Y = vertex, Z = focal length

C .X = focus, Y = principal axis, Z = focal length

D. X = radius of curvature, Y = focus, Z = principal​

Answer 1

To identify:

X , Y , Z parts of the concave mirror?

Identification:

X is the PRINCIPAL AXIS.

• The principal axis of a concave mirror is an imaginary line passing through the centre of curvature, focus and the pole of the concave mirror.

Y is the RADIUS OF CURVATURE.

• Radius of curvature is the radius of the glass sphere from which the concave mirror has been cut out.

Z is the FOCUS.

• Focus is a point on the Principal Axis of the mirror through which paraxial light rays after reflection from the concave mirror $\rm pa{s}s$ through.

• In case of concave mirrors, the focal length is considered to be negative as per sign convention with respect to cartesian co-ordinates.

$\star$ Hope It Helps.

Answer 2

Answer:

X is the PRINCIPAL AXIS.

The principal axis of a concave mirror is an imaginary line passing through the centre of curvature, focus and the pole of the concave mirror.

Y is the RADIUS OF CURVATURE.

Radius of curvature is the radius of the glass sphere from which the concave mirror has been cut out.

Z is the FOCUS.

Focus is a point on the Principal Axis of the mirror through which paraxial light rays after reflection from the concave mirror \rm pa{s}spass through.

In case of concave mirrors, the focal length is considered to be negative as per sign convention with respect to cartesian co-ordinates.

\star

Hope It Helps.