Question

A student focuses the image of a well illuminated distant object on a screen using a convex lens. Meter that he gradually moves the object towards the lens and each time focuses its image on the screen by adjusting the lens.; (a) In which direction – towards the screen or away from the screen, does the move the lens?; (b) What happens to the size of the image-does it decrease or increase?; (c) What happens to the image on the screen when he moves the object very close to the lens?(Delhi - 2016)

Answer 1

Explanation:

You can always use NaOH and neem oil for the saponification process in the preparation of soap. Mineral oil cannot be used for the reaction as the resulting soap will become oily or greasy. So, the correct answer is B) NaOH and neem oil.