NCERT Solutions for Chapter: Light, Shadows and Reflections, Exercise 1: Exercise

In a reflecting periscope, if a light ray is incident at ${45}^{\circ }$ angle at the first plane mirror, then the angle of deviation of the light ray by the periscope is _____.

If a light ray is reflected from a mirror as shown in the figure, then

Two plane mirrors are arranged perpendicular to each other. If a light ray is incident at ${30}^{\circ }$ on one of the plane mirrors of the above arrangement, then find the number of images that one can observe when one of the plane mirror is rotated by ${30}^{\circ }$ towards the other.

Gopi and Bhaskar arranged a pair of plane mirrors at an angle of ${120}^{\circ }$ and ${30}^{\circ }$, respectively. Who will observe more number of images when an object is viewed through mirrors at a symmetric position?

When two plane mirrors are inclined at an angle ${60}^{\circ }$ with each other, the number of images formed of an object placed symmetrically between them will be_____.

A pinhole camera of width $1 \mathrm{m}$ is focussed to an object at a distance $30 \mathrm{m}$ from it. If the height of the object is $3 \mathrm{m}$, what is the height of the image?

A cockroach is flying towards a plane mirror in perpendicular direction with a velocity of $4 \mathrm{mm} {\mathrm{s}}^{-1}$. Find the speed of its image in the mirror and also find out the angle of incidence, angle of incidence, angle of reflection and angle of deviation.

Calculate how many lumens make $62.8 \mathrm{candle} \mathrm{power}$.