Light Reflectio...

A man with normal near point $$(25 \,cm)$$ reads a book with small point using a magnifying glass, a thin convex lens of focal length $$5 \,cm$$.

What should be the distance between an object and a concave mirror of focal length of 20 cm so that a virtual image is produced at the distance of 10 cm form the mirror ?

An arrow is placed at a distance of 25 cm from a diverging mirror of focal length 20 cm. Find the image distance.

Light enters at an angle of incidence in a transparent rod of refractive index n. For what value of the refractive index of the material of rod the light once entered into it will not leave it through its lateral face whatsoever be the value of angle of incidence? 

A fish looking up through the water sees the outyside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface, the radius of this circle in cm is 

The refractive indices of water and glass are $$\frac{4}{3}\,and\,\frac{3}{2}$$ respectively. The refractive index of water respect to glass is ;

Light of frequency $$5\times 10^{14}\ Hz$$ is travelling in a medium of refractive index $$1.5$$. What is its wavelength ? $$(c=3\times 10^{8}\ ms^{-1})$$

A ray is inclident on boundary separating glass and  water Refractive index for glass is $$\frac{3}{2}$$ and refractive index for water is $$\frac{4}{3}$$ critical angle for glass-air boundary is

A ray of light is incident normally on one of the faces of a prism of apex angle $$30^o$$ and refractive index $$\sqrt 2$$. The angle of deviation of the ray is

A convex lens of focal length $$10\ cm$$ forms a vitual image of an object at $$30\ cm$$ from the lens. The magnification produced will be: