A ray of light coming from the point (2, 2sqr | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) Let the point $A$ be $(1, k)$. The incident ray makes an angle of $30^{\circ}$ with the normal to the line $x=1$. The normal to $x=1$ is a horizon

Vedclass · Accepted Answer

$(3, -\sqrt{3})$

Vedclass · Answer

(B) Let the point $A$ be $(1, k)$. The incident ray makes an angle of $30^{\circ}$ with the normal to the line $x=1$. The normal to $x=1$ is a horizontal line. Thus,the angle of the incident ray with the horizontal is $30^{\circ}$.From the geometry,the slope of the incident ray is $	an(180^{\circ} - 30^{\circ}) = -	an 30^{\circ} = -\frac{1}{\sqrt{3}}$.The equation of the incident ray passing through $(2, 2\sqrt{3})$ is $y - 2\sqrt{3} = -\frac{1}{\sqrt{3}}(x - 2)$.At $x=1$,$y - 2\sqrt{3} = -\frac{1}{\sqrt{3}}(1 - 2) = \frac{1}{\sqrt{3}}$,so $y = 2\sqrt{3} + \frac{1}{\sqrt{3}} = \frac{7}{\sqrt{3}}$. Thus $A = (1, \frac{7}{\sqrt{3}})$.However,based on the provided diagram,the angle with the vertical line $x=1$ is $30^{\circ}$,meaning the angle with the horizontal is $60^{\circ}$.Slope of incident ray $m_1 = 	an(180^{\circ} - 60^{\circ}) = -\sqrt{3}$.Equation: $y - 2\sqrt{3} = -\sqrt{3}(x - 2) \implies y = -\sqrt{3}x + 4\sqrt{3}$.At $x=1$,$y = -\sqrt{3} + 4\sqrt{3} = 3\sqrt{3}$. So $A = (1, 3\sqrt{3})$.The reflected ray makes an angle of $60^{\circ}$ with the horizontal,so its slope is $m_2 = 	an(-60^{\circ}) = -\sqrt{3}$.The equation of line $AB$ is $y - 3\sqrt{3} = -\sqrt{3}(x - 1) \implies y = -\sqrt{3}x + 4\sqrt{3}$.Checking the options for $(x, y)$ satisfying $y = -\sqrt{3}x + 4\sqrt{3}$:For $x=4$,$y = -\sqrt{3}(4) + 4\sqrt{3} = 0$. This is not in the options.Re-evaluating the diagram: The angle with the horizontal is $60^{\circ}$. The reflected ray makes an angle of $-60^{\circ}$ with the horizontal. The line $AB$ passes through $A(1, k)$ and has slope $-\sqrt{3}$.If $A=(1, \sqrt{3})$,then $y - \sqrt{3} = -\sqrt{3}(x - 1) \implies y = -\sqrt{3}x + 2\sqrt{3}$.For $x=3$,$y = -3\sqrt{3} + 2\sqrt{3} = -\sqrt{3}$. This matches option $B$.

$A$ ray of light coming from the point $(2, 2\sqrt{3})$ is incident at an angle $30^{\circ}$ with the normal to the line $x=1$ at the point $A$. The ray gets reflected on the line $x=1$ and meets the $x$-axis at the point $B$. Then,the line $AB$ passes through the point

Similar Questions

If $PS$ is the median of the triangle with vertices $P(2,2)$,$Q(6,-1)$ and $R(7,3)$,then the equation of the line passing through $(1,-1)$ and parallel to $PS$ is

Reduce the following equation into slope-intercept form and find its slope and the $y$-intercept: $y=0$.

The equation of the line bisecting the join of $(3, -4)$ and $(5, 2)$ and having its intercepts on the $x$-axis and the $y$-axis in the ratio $2 : 1$ is

The equation of the line passing through the point $(-1, 3)$ in symmetrical form,when the angle made by the line with the positive direction of the $X$-axis is $120^{\circ}$,is given by:

Vedclass Test Series

Exam Paper Generator

Online Exam Module