Equation of reflected Ray y−1=72​(x+2)7y−7=2x+42x−7y+11=0 Let the equation of other directrix is 2x−7y+λ Distance of directrix from Focub ea​−ae=53​8​3a−3a​=53​8​ or a=53​3​ Distance from other focus ea​+ae3a+3a​=310a​=310​×53​3​=53​10​ Distance between two directrix =e2a​=2×3×53​3​=53​18​​53​λ−11​​=53​18​λ−11=18 or −18λ=29 or −72x−7y−7=0 or 2x−7y+29=0