CBSE Class 12 Sample Paper for 2021 Boards

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Question 13 - CBSE Class 12 Sample Paper for 2021 Boards - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at August 14, 2026 by

Find the direction cosines of the normal to YZ plane?

Find the direction cosines of the normal to YZ plane? [Video]

 

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Question 13 Find the direction cosines of the normal to YZ plane? Normal to YZ plane would be x-axis x – axis makes an angle 0° with x – axis, 90° with y – axis & 90° with z – axis. So, 𝛼 = 0°, 𝛽 = 90°, 𝛾 = 90° l = cos 0°, m = cos 90°, n = cos 90° l = 1, m = 0, n = 0 ∴ Direction cosines of x – axis are 1, 0, 0

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