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ICSE Class 8 Physics Question 9 of 23

Light Energy — Question 11

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Question 11

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

Answer

The focus (F) of a concave mirror is a point on the principal axis at which the light rays incident parallel to the principal axis, meet (converge) after reflection from the mirror.

The focus (F) of a convex mirror is a point on the principal axis at which the light rays incident parallel to the principal axis, appear to meet after reflection from the mirror.

The distance of the focus from the pole of the mirror is called the focal length of the mirror.

What do you understand by the focus and focal length of a spherical mirror? Show them on separate diagrams for each of a concave mirror and a convex mirror. Light Energy, Concise Physics Solutions ICSE Class 8.