Light Reflectio...

Ram and Shyam observe a virtual image formed by a real object placed a distance $$\dfrac{f}{2}$$ in front of a convex lens of focal length $$f$$. Now they want to use a concave lens having a focal length f so that a virtual image is formed at the same distance from the lens as before. Where should the object be kept relative to the concave lens

The cause of mirage formation in desert areas is

If the light moving in a straight line bends by small but fixed angle while entering in different medium , it may be a case of :

Light is incident on a glass block as shown in Fig. If $$\theta_{1}$$ is increased slightly, what happens to $$\theta_{2}$$?

A ray of light is incident on a medium with angle of incidence $$i$$ and refracted into a second medium with angle of refraction $$r$$. The graph of $$sin(i)\ vs\ sin(r)$$ is as shown in fig. Then, the velocity of light in the first medium in $$n$$ times the velocity of light in the second medium. What should be the value of $$n$$?

Find the magnification and nature of the image when point $$O$$ is $$30\ cm$$ behind the mirror.

A beam of light converges towards a point O, behind a convex mirror of focal length 20 cm. Find the magnification and nature of the image when point O is 30 cm behind the mirror.

The diagram alongside shows the refraction of a ray of light from air to a liquid. Angle of incidence is :

The diagram alongside shows the refraction of a ray of light from air to a liquid. Angle of refraction is:

A converging beam of rays is incident on a diverging thin lens. Having passed through the lens the ray intersect at a point 15 cm from the lens. If lens is removed the point where the rays meet will move 5 cm closer towards the mounting that holds the lens. The focal length of lens is