Ray Optics and ...

The relation among u, v and f for a mirror is

While a moving picture is being screened, a boy introduced a glass slab thickness $$3\ cm$$ and refractive index $$1.5$$ between the projector and the screen. In order to have a clear picture on the screen, the screen show to be moved through a distance of :

In the given figure a Plane concave lens is placed on paper on which a flower is drawn. How far above its actual position does the flower appear to be?

A travelling microscope is focussed on an ink dot. When a glass slab $$(n = 1.5)$$ of thickness $$9\ cm$$ is introduced on the dot, the travelling microscope has to be moved by

The construction of Worlds largest telescope is started in which country?

The ray diagram could be correct

The relation among $$u,v$$ and $$f$$ for a mirror is:

A monochromatic ray of light is incident on the surface of a glass slab of thickness $$8\ cm$$, making and angle $$30^{\circ}$$ with the surface. The lateral displacement of the ray of light will be $$(\mu_{g} = \sqrt {3})$$.

A bucket of total height 60 cm is half filled with a liquid of refractive index 1.5 and half with another liquid of refractive Index 2. The apparent depth of the bucket for an observer directly above the bucket is

The sky appears blue, due