A student added few drops of universal indicator to a given colourless sample and observed the sample turning to red. The nature of sample is 

Correct Answer - 6.72 fringes

Answer is : (c) Arid soil

Correct Answer - `(i) 9/20 (ii) 7/20 (iii) 4/5 (iv) 11/20 (v) 13/20`

Correct option is  C) Acid

D) i, ii and iii

C) formation of clear and homogeneous solution

C) Brisk effervescence occurred

little (practically nothing) (she does not have money at all!)

When a light passes from one medium to another, at one interface, it changes its speed. The glass slab and prism both have two glass air interfaces. Hence, the light undergoes refraction...

D) Distance of the image behind the mirror is greater than the distance of the object from the mirror.