What is the principal focus of a spherical mirror?
A) It is a point from which the rays of light appear to be coming from on the principal axis of a convex mirror
B) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection or appear to be arising from this point on the principal axis
C) It is the centre of a hollow sphere of which the spherical mirror is a part
D) It is the midpoint of a spherical mirror
A) It is a point from which the rays of light appear to be coming from on the principal axis of a convex mirror
B) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection or appear to be arising from this point on the principal axis
C) It is the centre of a hollow sphere of which the spherical mirror is a part
D) It is the midpoint of a spherical mirror
Answer & ExplanationAnswer: B) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection or appear to be arising from this point on the principal axis
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A sentence has been given in Direct/Indirect Speech. Out of the four given alternatives, select the one which best expresses the same sentence in Indirect/Direct Speech.