Discussion
Assertion (A): An eighteen per cent grey card appears mid grey rather than dark.
Reason (R): Lightness follows approximately the cube root of the luminance factor.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Lightness follows roughly the cube root of the luminance factor, and \( 0.18^{1/3} \approx 0.56 \), which places an 18 per cent card near the middle of the lightness scale. This is why photographers use such a card as a mid-tone reference despite its low reflectance.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development