🔍 Key Concepts

• Difference between luminous range and geographical range of a light • Role of meteorological visibility (how clear the atmosphere is) in how far a light can be seen • Which factors are related to the light itself versus the observer’s position

💭 Think About

• Ask yourself: Which option describes a condition of the atmosphere between you and the light, not the positions of light or observer? • Which of these factors would a luminous range diagram or table normally adjust for when predicting how far a light can be seen? • Which factor is handled separately when you work with geographical range instead of luminous range?

✅ Before You Answer

• Identify which choices relate to height/elevation (these are usually tied to geographical range, not luminous range). • Identify which choice relates to visibility or clarity of the air between light and observer. • Consider whether background glare is normally included in standard luminous range tables or if it’s treated as a separate, practical consideration.