Two vertical plane mirrors are inclined at an angle of $60^\circ$ with each other. $A$ ray of light travelling horizontally is reflected first from one mirror and then from the other. The resultant deviation is.....$^o$

The rear window of a car has a size of $120 \, cm \times 45 \, cm$. The driver sits at a distance $L = 2 \, m$ from the rear window. What should be the minimum size of a flat mirror,hanging at a distance of $0.5 \, m$ in front of the driver,so that he has the best view of the road situation behind the car?

Which one of the following statements is true?

At what angle (in degrees) should two plane mirrors be inclined to obtain $3$ images?

The light rays from an object have been reflected towards an observer from a standard flat mirror. The image observed by the observer is:

Light of wavelength $5000 \,\mathring{A}$ falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?