Ray Optics and ...

A printed page is kept pressed by a glass cube $$(\mu = 1.5)$$ of edge $$6 cm$$. By what amount will the printed letters appear to be shifted when viewed from the top?

The bottom of a vessel filled with a liquid $$($$refractive index $$= 1.4)$$ appears to be $$15 cm$$ deep when looked vertically downwards. What is the actual depth of the liquid?

A swimming pool appears to be raised by $$6 m$$ when viewed normally. What is the refractive index of water if the actual depth of the swim-ming pool is $$24 m$$?

The distance between the pole and centre of curvature of a spherical mirror is called _________ .

When the length of a microscope tube increases, its magnifying power

A dot on a paper appears to be raised by $$2 cm$$ when viewed normally through a glass slab placed on it. Calculate the thickness of the glass slab if its refractive index is $$\displaystyle \frac {3}{2}$$.

LASER belongs to the range of

A point source of light is kept in front of a convex mirror of radius of curvature $$40 cm$$. The image is formed at $$10 cm$$ behind the mirror. Calculate the object distance

A student measures the thickness of a human hair by looking at it through a microscope of magnification $$100$$. He makes $$20$$ observations and finds that the average width of the hair in the field of view of the microscope is $$3.5$$ $$mm$$. What is the estimate on the thickness of hair?

A thin glass (refractive index 1.5) lens has optical power of $$-5 D$$ in air. Its optical power in a liquid medium with refractive index 1.6 will be: