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What do you understand by the focus and focal length of a spherical mirror? Show them on the separate diagrams for each of a concave mirror and a convex mirror. - Physics

Short Note

What do you understand by the focus and focal length of a spherical mirror? Show them on the separate diagrams for each of a concave mirror and a convex mirror.

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Solution

FOCUS: For concave mirror

“A point on the principal axis at which the light rays incident parallel to the principal axis meet after reflection from the mirror.

FOCAL LENGTH: “The distance between focus and pole”. FP is focal length for a concave mirror.

FOCUS: For Convex mirror
“A point on its principal axis at which the light rays incident parallel to the principal axis appear to meet after reflection from the mirror”.
FOCAL LENGTH: “The distance between P and F is F.L.”

Concept: Terms Related to Curved Mirrors:Focus, Principal Axis, Centre of Curvature, Radius of Curvature
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APPEARS IN

Selina Concise Physics Class 8 ICSE
Chapter 5 Light Energy
Short/long Answer Question | Q 27 | Page 100
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