A ray of light is incident on a plane mirror | vedclass

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

Question

(B) When a plane mirror rotates by an angle $	heta$, the reflected ray rotates by an angle $2	heta$.Given angular acceleration $\alpha = 4\pi \, rad

Vedclass · Accepted Answer

$45$

Vedclass · Answer

(B) When a plane mirror rotates by an angle $	heta$, the reflected ray rotates by an angle $2	heta$.Given angular acceleration $\alpha = 4\pi \, rad/s^2$ and time $t = \frac{1}{4} \, s$.The angle of rotation of the mirror is $	heta = \omega_0 t + \frac{1}{2} \alpha t^2$.Since the mirror starts from rest, $\omega_0 = 0$.$	heta = \frac{1}{2} 	imes (4\pi) 	imes (\frac{1}{4})^2 = 2\pi 	imes \frac{1}{16} = \frac{\pi}{8} \, radians$.Converting radians to degrees: $	heta = \frac{\pi}{8} 	imes \frac{180^\circ}{\pi} = 22.5^\circ$.The reflected ray rotates by $2	heta = 2 	imes 22.5^\circ = 45^\circ$.

$A$ ray of light is incident on a plane mirror at rest. The mirror starts turning at a uniform angular acceleration of $4\pi \, rad/s^2$. The reflected ray at the end of $\frac{1}{4} \, s$ must have turned through......$^o$

Similar Questions

Two plane mirrors are at right angles to each other. $A$ man stands between them and combs his hair with his right hand. In how many of the images will he be seen using his right hand?

$A$ ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of $300^o$. The number of observable images is:

Images formed by an object placed between two plane mirrors whose reflecting surfaces make an angle of $90^o$ with one another lie on

Two plane mirrors are parallel to each other and an object $O$ is placed between them. Then the distance of the first three images from the mirror $M_2$ will be (in $cm$):

As shown in the figure,a particle is placed at $O$ in front of a plane mirror $M$. $A$ man at $P$ can move along the path $PY$ and $PY'$. Which of the following is true?

Vedclass Test Series

Exam Paper Generator

Online Exam Module