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
A word is represented by only one set of numbers as given in any one of the alternatives. The sets of numbers given in the alternatives are represented by two classes of alphabets as shown in the given two matrices. The columns and rows of matrix-I are numbered from o to 4 and the matrix-II are numbered from 5 to 9. A letter from these matrices can be represented first by its row and next by its column, for example, F can be represented by 13, 21 etc and Y can be represented by 97,98 etc. Similarly, you have to identify the set of the word 'TONE'
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