Light Reflectio...

A convex mirror of focal length $$f$$ (in air) is immersed in a liquid $$\displaystyle \left( \mu =\frac { 4 }{ 3 }  \right) $$. The focal length of the mirror in liquid will be:

An image of the same size as that of the object cannot be produced by :

A student uses a converging lens to produce an enlarged virtual image of a scale she wishes to read accurately. The focal length of the lens is $$10\;cm$$. What is a suitable distance between the scale and the lens ?

Which of the following does not represent correct refraction?

Magnification produced by a convex mirror is always:

A ray of light enters a slab of material with increasing refractive index. Four possibilities of the trajectory of the ray are shown below.
The correct choice is:

An under-water swimmer cannot see very clearly even in absolutely clear water because of:

Linear magnification produced by a concave mirror may be 

The linear magnification for a mirror is the ratio of the size of the image to the size of the object, and is denoted by $$m$$. Then we may write: (symbols have their usual meanings)