Recommended reflectance value for the ceiling in a room is:

Correct option is D

The recommended reflectance value for the ceiling in a room is 80-90%. High reflectance ceilings help to maximize the distribution of natural and artificial light within a room by reflecting a greater amount of light, which improves brightness and reduces the need for excessive lighting fixtures.
Information Booster: Reflectance refers to the ability of a surface to reflect light. Ceilings with high reflectance (80-90%) are typically painted in light colors, especially white or off-white shades, which reflect most of the light hitting them. This enhances visual comfort and energy efficiency by improving the illumination of the space. Lower reflectance values can cause more light absorption, leading to darker rooms and increased energy consumption for lighting.
Additional Knowledge:
· (a) 20-30%: This low reflectance is typical of darker colors and would absorb much light, unsuitable for ceilings.
· (b) 40-50%: Moderate reflectance but not ideal for ceilings where maximum light reflection is desired.
· (c) 60-70%: Better than the above but still lower than the recommended high reflectance for ceilings.