Let one focus of the hyperbola be at and the corresponding directrix be . If and respectively are the eccentricity and the length of the latus rectum of , then is equal to:
- (A)14
- (B)15
- (C)16✓ Correct
- (D)12
Answer: (C)
Solution
Given: focus at means , and directrix means .
Multiplying these: .
Then , so .
Using .
Length of latus rectum: .
Therefore: .
Multiplying these: .
Then , so .
Using .
Length of latus rectum: .
Therefore: .
JEE Main · 2025 · 02 Apr 2025 · Shift 1 · Single correct option