Question 1 :
The image of an object formed by a device isalways virtual and small. The device may be

Question 2 :
A light ray passes from a material of low refractive index to one of high refractive index. Which of the pairs of quantities listed below describes the light ray as it strikes and passes through the interface between the two materials? Match the descriptions below with the statement that&#160;<i>best</i>&#160;describes the situation.<br/>A part of the light ray remains inside the low refractive index material:<br/>

Question 3 :
In vacuum, to travel distance 'd', light takes time 't' and in medium to travel distance $'5d'$, it takes time 'T'. The critical angle of the medium is.<br>