Lens Makers Formula/ Len's Formula: Practice Problem & Solution
Assertion (A): Warning signals installed at the top of tall buildings and monuments employ red light. Reason (R): Human eye is most sensitive to red colour.
Solution Explained:
To solve this problem, we apply the core principles of Lens Makers Formula/ Len's Formula. Understanding the underlying formula is key to arriving at the correct answer below:
Red light has the longest wavelength and scatters least, making it visible from a distance. Thus, (A) is true. However, the human eye is most sensitive to yellow-green light (approximately \(555\text{ nm}\)), not red. Thus, (R) is false. So, (A) is true but (R) is false.
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