Question

answer this question..............​

Answer 1

1️⃣Plaster of Paris , [formula in attachment]

2️⃣Absence of the cones will lead to loss of perception of color. Cones are also are able to view process finer details of images than the other photo-receptor cells(rods and photosensitive retinal ganglion cells) and process rapid changes of images.

3️⃣For n-shell, n=4

Now, for n=4, there are 4 sub shells : s,p,d and f out of these, s is circular. All the others are elliptical.

Hence, N shell has 3 elliptical orbits.

4️⃣All the incident rays parallel to the principal axis pass through the focus of the lens after refraction and vice-versa.

Also the ray through the optical center of the lens passes undeviated i.e diagram I is correct.