Ray Optics and ...

A fish in water sees an object $$24\ cm$$ above the surface of water. The height of object above the surface of water as it appear to the fish is 

The image of an object formed by a device is always virtual and small. The device may be 

A real image of a distant object is formed by a plano-convex lens on its principal axis. Spherical aberration is :

A plane mirror is placed along the x-axis facing negative y-axis. The mirror is fixed. A point object is moving with $$3\hat { i } +4\hat { j } $$ in front of the plane mirror. The relative velocity of image with respect to its object is

Two mirrors at an angle $$\theta $$ produce 5 images of a point. The number of images produced when $$\theta $$ is decreased to $$\theta - 30 $$ is

A glass prism of refractive index $$1.5$$ is immersed in water (refractive index $$4/3$$). A light beam incident normally on the face:$$AB$$ as shown in the figure is totally reflected to reach the face $$BC$$ if:

A light ray is incident at an angle of $${45}^{o}$$ with the normal to a $$\sqrt {2}cm$$ thick plate ($$\mu =\sqrt2$$). Find the shift in the path of the light as it emerges out from the plate.

In the given situation, a spherical transparent surface of radius $$R$$ is placed. The refractive index of sphere is such that image for an object kept at distance $$R$$  is formed at the same distance of the opposite side. What is refractive index of sphere?

An air bubble is inside water. The refractive index of water is $$4/3$$. At what distance from the air bubble should a point object be placed so as to form a real image at the same distance from the bubble?

An equilateral prism deviates a ray through $$45^{\circ}$$ for the two angles of incidence differing by $$20^{\circ}.$$ The angle of incidence is