Ray Optics and ...

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 

A convex lens of focal length f produces a real image 3 times as that size of the object, the distance between the object and the lens is .

The eye can be regarded as a single refracting surface. The radius of this surface is equal to that of cornea (7.8 mm). This surface separates two media of refractive indices 1 and 1.34. Calculate the distance from the refracting surface at which a parallel beam of light will come to focus. 

An object is kept at 0.200 m from a double convex lens or biconvex lens of focal length $$0.0150 m$$ .The position of the image is

A ray of light is incident at an angle of $$60^{\circ}$$ on one face of a prism of angle $$30^{\circ}$$. The emergent ray of right makes an angle of $$30^{\circ}$$ with incident ray. The angle made by the emergent ray with second face of prism will be

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? 

Find the resolving power of a microscope with cone angle of light falling on the objective equal to $$60^0$$ [Given, $$\lambda = 600 nm$$ and $$\mu_{air}  = 1$$]

A 2 cm diameter coin rests flat on the bottom of a bowl in which the water is which the water is 20 cm deep $$\left( { \mu  }_{ w }=4/3 \right) $$. if the coin is viewed directly from above, what is the apparent diameter:

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

which instrument is used to check whether the body is charged or not?